As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GATE AGENT REPORT EXTERIOR 1L DOOR LATCH IN VERTICAL POSITION ON ARRIVAL & OCCURED ON PREVIOUS FLIGHT, HEARD IT POP ON THIS FLIGHT DURING CLIMB THROUGH 18,000 FT. ADJUSTED DOOR & RIGGED IAW AMM 52-11-00. DOOR OP CK GOOD. (8770567) AIRCRAFT WAS GROUNDED