What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: CLIMBING THROUGH FL 220, NOTICED WIRE AND STRING FLAPPING UP AGAINST CAPTAIN BOTTOM OF SIDE WINDOW. AT ABOUT 24,500 LOUD SQUEAL STARTED COMING FROM WINDOW AREA; AIRCRAFT AIR INTERRUPTED BACK TO AND LANDED SAFELY AT ORD. RETORQUED AND REAPPLIED AERODYNAMIC SEALANT TO CAPTAINS L1 WINDOW. PER AMM 56-11-11 AND PERFORMED PRESSURE LEAK TEST OF CAPAINS L1 WINDOW, PER AMM 05-51-91.