HK Lucas Performer 900W Subwoofer with Low Bass Volume Output This Needs Methodical Fault Finding!

A Customer brought me a Lucas Performer 900W Sub. It has low output on the Bass but the satellite speakers (tops) are working well. I took a quick look at this in a previous video and ordered some parts. Let's see what happens now they have arrived...

You will find Part One of this repair here
https://www.youtube.com/watch?v=8L58GpRHzEI starting from 13:20

I work in collaboration with:
The Electronics Channel (live streams with Carlos and Detlef)
https://www.youtube.com/@Theelectronicschannel

Gran Canaria Uncovered
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Det Builds Stuff - https://www.youtube.com/@detbuildsstuff8128 (Detlef)
Retro Upgrade - https://www.youtube.com/@RetroUpgrade (Carlos)

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Equipment used in my videos. These are affiliate links, you pay the normal price and I make a small commission.

TEST METERS
Aneng AN8009
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KM601
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VC480C+
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MESR-100 ESR METER
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XC6013L CAPACITOR METER
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TM-902C TEMPERATURE METER
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FNB58 USB ANALYZER
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PCI POST ANALYZER
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TL460S Plus PCI_E ANALYZER
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TOOLTOP ET829 SCOPE METER
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MULTIMETER PROBE KIT KET05
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BENCH PSU
NPS3010W
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SOLDERING
T12 Station with M8 9501 Handle
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M8 9501 HANDLE
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T12-BC3 Tip
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SUGON T26D
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QUICK 861DW
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PROS'KIT SS-331H
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SS-331H Spare Parts
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THERMAL CAMERA
Infiray P2 Pro
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MICROSCOPES
Amscope Optical Microscope (copy)
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ANDONSTAR AD407
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EEPROM Programming
TL866 II+
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CH341A
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1.8V ADAPTER
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CONSUMABLES
NC-559-ASM FLUX
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DESOLDER BRAID (I use size 8045)
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MECHANIC HX-T100 Solder 63:37 (I use 0.6mm)
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ESD-11 TWEEZERS
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Thank you
Richard