As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INFO TO MX: APPROX 1.5 HRS INTO FLIGHT A CONT. LOUD SQUEALING NOISE BEGAN. SEEMED TO BE COMING FROM COCKPIT DOOR. FA COULD HEAR IN FWD GALLEY. WE DID AN ENROUTE CLB + NOISE STOPPED AT 700 FT ABOVE ORIGINAL CRUISE ALT. // FOUND FENOLIC STRIP BENT ON TOP OF 1R DOOR. RE-SECURED. PRESSURIZED A/C PER AMM 05-53-00-780-002-A-01. TO 7.8 PSI, NO LEAKS DETECTED. OK FOR SVC.