The game sometimes slam tilts as the ball goes down the right outlane.

Monster Bash slam tilts on a right outlane drain

Cause: Airballs short the switch behind Frank, which only happens with the Frank targets raised.

Checks

• Inspect the switch behind Frank.

Fix

• Repair or protect that switch so a flying ball can't short it.

Systems

• WPC-95

Games

• Monster Bash

Related tips

• Phantom flip never lights after a factory reset: it needs games to relearn
• Auto-adjust eddy board LED flashes constantly
• Tales of the Arabian Nights resets after six tiger loops

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