Test score wheel rotation. Does it rotate smoothly? Solenoid is obviously bad

Test lamp, identify bulb type.

Use variac for testing.

Check Jones plug connectors. Look for visible problems. Then connect them and test continuity for each

Use ~100psi compressed air outdoors to clean dust off control cabinet wires and score cabinet wires

110V compressor is in workroom

Wear goggles and a dust mask

Test motor using variac

Identify solenoid types. Only a few have visible labels.

Test transformer

Playfield is dirty

Entry gate is corroded and sticky

Playfield guide springs are rough and need polishing