The ball hits a troll but the hit isn't always registered.

Medieval Madness: troll hits not always counted

Cause: A broken solder joint on the troll head switch wiring, or loose contact rivets on the switch blades.

Checks

• Inspect the switch wires and the switch stack on the troll head.

Fix

• Resolder broken wires.
• Remove the switch and peen the stack rivets with a small hammer to take out the play.

Systems

• WPC-95

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