Presented non working, dirty machine : How many hours do you think it would take to do some minor board diagnostics and repair, removing and soldering in a relay and a few transistors, a resistor on display board, tear down, clean, wax , install leds and color match. a refurbish on flippers and related coils, Ultrasonic clean removed parts, put it all back together, adjust where needed etc.
5 hours? 10? 15?