What was found
LOUD SQUEALING FROM CAPTAIN SIDE WINDOWS INCREASING WITH ALTITUDE L2 & L3 WINDOWS WERE REPLACED ON THE 16TH AND 18TH. PRESSURIZ ED THE ACFT AT THE GATE & OBSERVED BUBBLES (LEAKING) FROM EXTERIOR AT L2 WINDOW & PER DEBRIEFING WITH PILOT AIR BLOWING INTO THE FLT DECK FROM THE L3 WINDOW. REMOVED NER 5 CASCADE WINDOW BLANK IAW 56-11-41. INSTALLED REPLACEMENT NR 5 LT CASCADE WINDOW BLANK IAW AMM 56-11-41-400-801-C1, WINDOW STILL LEAKING. INSTALLED NR 5 LT CASCADE WINDOW BLANK UP TO AND INCLUDING STEP D(1)H REF AMM 56-11-41-400-801-C1. NEXT STEP REQUIRED IS D(1)I, BONDING CHECK. LEAK CHECKED GOOD. IAW AMM 56-11-41-400-801-C1 PERFORMED D(1)I, BONDING CHECK. BONDING CHECK PASSED IAW AMM 56-11-41-400-801-C1. INSTALLED INTERIOR BROW PANEL CAPT SIDE IAW AMM 25-11-21 NO DEFECTS NOTED. PAINTED PANEL IAW GPM 10-01-01 AND GPM 05-30-06 NO DEFECTS NOTED. ACFT OK FOR SERVICE.