What was found
FLIGHT ATTENDANTS REPORT VERY LOUD SQUEAL COMING FROM THE R2 DOOR. PRESSURIZATION WAS NORMAL THROUGHOUT THE ENTIRE FLIGHT. GROUNDED - YES. REMOVED R2 DOOR SCUFF PLATES REF B737-800 AMM 53-11-37-600-807 STEP 7.E.(4). REMOVED OLD SEALANT FROM THE AIRCRAFT STRUCTURE AND SCUFF PLATES. RESEALED AND REINSTALLED SCUFF PLATES PER AMM 53-11-01. PRESSURIZATION FOR LEAK CHECK REQUIRED AFTER SUFFICIENT SEAL CURE. PRESSURIZED ACFT TO 3 PSID, NO LEAKS AND NO SQUEALS NOTED. (REF TSR713264)