Hi all — I’m trying to diagnose the plate amplifier from a Definitive Technology BP7006 tower.

Symptoms:
- The amp powers on (red light illuminated)
- No subwoofer output
- Main towers still play normally through my receiver
- No audible hum or noise from the sub section

What I’ve done so far:
- Verified fuse continuity
- Visual inspection: no burned parts
- Confirmed speaker driver reads ~5Ω DCR
- Board ID: LT-C126 (stamped on the PCB)
- Cap glue confirmed factory adhesive, not leakage
- Using a UNI-T...