As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: ON MULTIPLE OCCASIONS L1 DOOR WARNING CAME ON IN FLIGHT. ACCOMPLISHED PROXIMITY SWITCH ELECTRONICS UNIT (PSEU) BITE PROCEDURE PER AMM 32-09-00. FOUND PSEU INTERNAL FAULT. REPLACED PSEU PER AMM 32-09-10 AND ACCOMPLISHED SATISFACTORY OPERATIONAL TEST PER AMM 32-09-10. ACCOMPLISHED FIM 52-10-00-810-801 FOR L1 DOOR. NO FURTHER FAULTS FOUND.