Issue: No background music. Fix: U42 (music control PIA) outputs test OK with Leon ROM but corrosion in area. Remove U41/42 PIAs, clean corrosion, and add sockets. No continuity from U42-16/17 to SRC3, fixed. Install new U41/42 PIAs. Remove U37 (LS138), clean corrosion, and add socket. Install new U37 chip.
Tag: No sound
Issue1: Won’t start a game. Fix1: Tilt bob stuck closed. Issue2: No sound. Fix2: Bad volume pot, replace with resistor of reasonable value (no replacement pot on-hand) Issue3: Some controlled lamps not working. Fix3: Replace bad bulbs and one socket.