As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB- FA REPORTS THREE LOUD SOUNDS COMING FROM MAIN CABIN DOOR DURING CLIMB OUT. CABIN PRESSURE INDICATING NORMAL. GROUNDED - YES. CLEANED MAIN DOOR SEAL. CONDITION OF SEAL GOOD. PERFORMED CABIN PRESSURIZATION TO DP OF 7 PSI TWICE. IAW WITH AMM 213000-780801. NO NOISE DETECTED. OK FOR SERVICE.