What was found
SQUEAL COMING FROM R4 FORMER WINDOW FRONT BOTTOM CORNERUPDATED MAA CODE FIX USING VENDOR MAA SCREEN PLEASE CONTACT TOMC BEFORE COMMENCING ANY WORK. TOMC UPDATE: CREW REPORTED SQUEAL STARTED AT FL180 & GOT LOUDER AS THEY CLIMBED. AT 5 PSI, SOUND GONE. DESCENDED TO FL290, REPRESSURIZED TO 7.5 PSI, NOISE STILL GONE. REMOVED RT EYEBROW PAD, LOWERED SUN VISOR TRACK, & REMOVED DECORATIVE COVER & INSULATION TO GAIN ACCESS TO NR 4 RT WINDOW BLANK. FOUND TORN O-RING SEAL. THIS IS THE SUSPECTED CAUSE OF LEAK. PLASTILOCK SEAL & GASKET, REF AMM 56-11-41-400-801-C1 SECTION D. (1)(C) & AIPC 56-11-51-02 FIG ITEM 60A & 60B) SHOULD ALSO BE REPLACED WHEN WINDOW BLANK IS REMOVED & REINSTALLED. R & R DAMAGED SEALS & REINSTALLED BLANKING PLATE IAW AMM 56-11-41. PERFORMED LEAK CHECK, PLUG CONTINUES TO LEAK. REPLACED R4 WINDOW BLANK SEAL AGAIN. PRESSURIZED AC TO 5 PSID. NO SQUEAL/LEAKS NOTED. WINDOW PLUG INSTALLATION COMPLETE UP TO STEP D(1)(G), STILL NEEDS FINAL TORQUE CK. WINDOW SEAL REPLACED & LEAK CHECKED GOOD.