One lower flipper does nothing, while any upper flipper still works.

Lower flipper dead on Jurassic Park, Last Action Hero or Tales from the Crypt

Cause: Design fault in flipper boards 520-5033-03 (JP, TftC) and 520-5070-00 (LAH): the lower flippers need their normally closed EOS switch to be closed, so a broken or misadjusted EOS kills that flipper.

Checks

• Check the EOS switch on the dead flipper: with the flipper at rest it must be closed.
• Look for a cracked or bent EOS blade.

Fix

• Adjust or replace the EOS switch. The sturdier later blade has a bend near its tip.
• For a lasting cure, fit 520-5076-00 (three flipper) in place of 520-5033-03, or 520-5080-00 (two flipper) in place of 520-5070-00; both are backward compatible.
• Or modify the original board as described in service bulletin 54.

Systems

• Data East CPU Version 3
• Data East/Sega CPU Version 3b

Games

• Jurassic Park
• Last Action Hero
• Tales from the Crypt

Related tips

• Jurassic Park, Last Action Hero, Tales from the Crypt: flipper dead from its EOS switch
• Two flipper boards on WWF Royal Rumble and Baywatch
• Adapting a 520-5080-00 flipper board to non-EOS games
• Flipper rebuild part numbers (pre-Whitestar)
• Solid state flipper does not work: fuses and fuse clips
• Solid state flipper goes up but will not stay up
• Protect the flipper boards when lifting the playfield
• Flipper board LEDs show the cabinet buttons are seen

Source: Repairing DataEast 1987 (Laser War) to Sega 1995 (Batman Forever), Part One, Clay Harrell (pinrepair.com)