with qbert i had to rebuild the neck board on the monitor, completly rebuild the power supply, change the audio amp on the sound board (i still have more chips i have to replace)  paint the cabinet and coin doors    all thats left now it to get the rest of the sound working , replace some crappy connectors, and get a new cpo 
qbert was a pain to work on  i guess thats why you dont see very many. theres too many people with no patients who own a big hammer 
baby pacman i had to repair the monitor,  touch  up playfield, replace the rubbers on the playfield,  fix a couple solonids, light sockets, sand and paint cabinet and coin door. all it needs is a spring for one of the popups and a new cpo