The game keeps kicking out balls, or the switch matrix acts confused, with one switch closure showing as several.

Indiana Jones: balls keep ejecting from a crushed mini-playfield switch

Cause: Balls strike the front right switch on the underside of the mini-playfield and crush its wires, diode and lugs together. That switch shares a matrix row with the trough jam opto, so the game thinks a ball is jammed and ejects another.

Checks

• Inspect the front right switch under the mini-playfield for squashed lugs, wires or diode touching.

Fix

• Separate and repair the crushed wiring and diode, and replace the switch if needed.

Systems

• WPC DCS

Games

• Indiana Jones: The Pinball Adventure

Related tips

• Indiana Jones: exposed switches at the Path of Adventure get bent together
• Indiana Jones: Path of Adventure stutters when moved with the flipper buttons
• Indiana Jones: flippers die, one display line lit, balls keep launching
• Indiana Jones: left slingshot switch touching a GI socket
• Indiana Jones: no optos work, check J905 on the Fliptronics II board
• Indiana Jones: finding which optos make the Path of Adventure stutter
• Indiana Jones ninth switch column
• One switch also triggers others in its column: bent diode on the mini playfield

Source: Repairing Williams/Bally WPC Pinball Games from 1990 to 1999, Part Three, Clay Harrell (pinrepair.com)