Here's a follow up image from my first post on this Bally 1978 Playboy machine. I've opened the backbox and the mpu looks like this (mainly corrosion on bottom). The light blinks
PLAYBOY CLASSIC BALLY PINBALL MACHINE 1978
HUGH HEFNER PLAYBOY PINBALL MACHINE
ADDENDUM ITEM - 1978 PLAYBOY PINBALL MACHINE BY BALLY.