Harman Kardon Amplifier HK775 - Recapped - Needs new pre-driver pc board

Description

Being sold as is, please review pics, has some scratches on top of faceplate.  This unit was recapped a few years ago and serviced extensively, at the bottom of listing is a list of parts that were replaced.  Recently experience crackling from unit, sent to local tech and he came back with this report:
Customer reported intermittent distortion issues. Tested initially with no load using signal generator and scope and observed a clean sine wave. Did additional extensive run up using a huge 8ohm dummy load, signal generator, scope and HP distortion analyzer....when tapping chassis, the distortion would appear. I found lots of heat damage on the pre-driver pc board. Proceeded to reflow solder traces and solder in jumpers in an attempt to get the circuit to perform as intended. Did an additional run up and observed a clean sine wave and ultra low distortion (amps had been recapped). When amp was put back into service and went through heat cycles, distortion came back. I believe a new (used) board is needed as the heat damage was too extensive to repair.
Part list repaired in 2019:
4 .22 .88
4 Shipped 06-Aug-19
53472049
Mouser #:
647-UPW1H102MHD
Mfr. #:
UPW1H102MHD
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 50volts 1000uF AEC-Q200
4 .39 .56
4 Shipped 06-Aug-19
53472049
Mouser #:
647-UPW2A102MHD
Mfr. #:
UPW2A102MHD
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 100volts 1000uF AEC-Q200
4 .68 .72
4 Shipped 06-Aug-19
53472049
Mouser #:
555-RFS25V100ME3#5
Mfr. #:
RFS-25V100ME3#5
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 10uF 25V 20% Audio SILMIC II
12 {{detail_product_description}}.207 .48
12 Shipped 06-Aug-19
53472049
Mouser #:
555-RFS25V330MG3#5
Mfr. #:
RFS-25V330MG3#5
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 33uF 25V 20% Audio SILMIC II
2 {{detail_product_description}}.68 .36
2 Shipped 06-Aug-19
53472049
Mouser #:
555-RFS16V470MG3#5
Mfr. #:
RFS-16V470MG3#5
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 47uF 16V 20% Audio SILMIC II
2 {{detail_product_description}}.68 .36
2 Shipped 06-Aug-19
53472049
Mouser #:
555-RFS50V010MF3#5
Mfr. #:
RFS-50V010MF3#5
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 1uF 50V 20% Audio SILMIC II
6 {{detail_product_description}}.39 .34
6 Shipped 06-Aug-19
53472049
Mouser #:
555-RFS16V101MH3#5
Mfr. #:
RFS-16V101MH3#5
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 100uF 16V 20% Audio SILMIC II
4 {{detail_product_description}}.67 .68
4 Shipped 06-Aug-19
53472049
Mouser #:
647-UPW2A220MPD
Mfr. #:
UPW2A220MPD
Desc.:
Aluminum Electrolytic Capacitors - Radial Leaded Aluminum Electrolytic Capacitors - Radial Leaded 100volts 22uF AEC-Q200
8 {{detail_product_description}}.42 .36
8 Shipped 06-Aug-19
53472049
Mouser #:
594-5073NW6K800J
Mfr. #:
PR01000106801JR500
Desc.:
Metal Film Resistors - Through Hole Metal Film Resistors - Through Hole 1watt 6.8Kohms 5%
4 {{detail_product_description}}.18 {{detail_product_description}}.72
4 Shipped 06-Aug-19
53472049
Mouser #:
568-NYS367-0
Mfr. #:
NYS367-0
Desc.:
RCA Phono Connectors RCA Phono Connectors RCA PANEL JACK GOLD/BLACK REAN
2 .31 .62
2 Shipped 06-Aug-19
53472049
Mouser #:
273-6.8K-RC
Mfr. #:
273-6.8K-RC
Desc.:
Metal Film Resistors - Through Hole Metal Film Resistors - Through Hole 6.8Kohms 1% 50PPM
4 {{detail_product_description}}.16 {{detail_product_description}}.64
4 Shipped 06-Aug-19
53472049