What was found
R2 WINDOW HAS LOUD SQUEAL WHICH STARTED ON CLIMB THROUGH DESCENT, AND IN CRUISE. EVIDENCE OF AIR LEAKAGE. PERFORMED R2 WINDOW ADJUSTMENT PER AMM 56-11-02-825-122, STEP 2.J(1)(H). APPLIED FILLET SEALANT TO LOWER AFT CORNER OF R2 SEAL PER AMM 56-11-11-404-006.G(7)(9). PRESSURIZED AIRCRAFT TO 4.0 DIFF, NO LEAKAGE NOTED.