Quoted from pb456:... wondering if someone could point me to a schematic of the A-15430 pretty please?
Page 3-19 of the manual. Download the PDF from IPDB (https://www.ipdb.org/files/1267/Williams_1993_Indiana_Jones_The_Pinball_Adventure_English_Manual.pdf).
The board is almost certainly repairable but if you continue having problems with that board or want to get a new one I have a reproduction (uses +12V) or a redesign (uses +5V with indicator LEDs).