What was found
AT FL 340 LOUD CYCLING SQUEAL FROM RT COCKPIT WINDOW AT AFT PORTION BEHIND PLASTIC COVER WITH HIGH DIFFERENTIAL PRESS. THE SOUND STOPPED DESCENDING THROUGH FL 320 & DID NOT OCCUR AGAIN DURING DIVERT AT FL 220. ACCOMPLISHED VISUAL INSPECTION OF NR 2 & 3 RT WINDOW IAW 56-11-02-706-001. ACCOMPLISHED PRESS CHECK IAW 05-51-24-782-221-001, FOUND ONLY PLASTIC PROTECTION SHEET STUCK IN UPPER LT CORNER OF NR 3 RT WINDOW. CLEANED NR 2 & 3 WINDOW SEALS & TORQUED NR 2 RT IAW 56-11-10-004-001 & AGAIN ACCOMPLISHED PRESS CHECK TO 4 PSID. NO LEAKS DETECTED OUTSIDE.