As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L1 DOOR NOT SEALING. PRESSURE NORMAL. GROUNDED - YES. AIR TURNBACK - FOUND FWD ENTRY DOOR FLAPPER ASSY BENT. REMOVED AND REPLACED L1 FLAPPER ASSY REF B737-800 AMM 52-11-00-020-801 AND AMM 52-11-00-420-801. AIRPLANE PACK OPERATION-CONFIDENCE CHECK GOOD NO LEAKS OR EXCESSIVE NOISE NOTED. REF AMM 21-00-05-780-801.