What was found
(CAN) DISCREPANCY: AT FL 37.0 VERY LOUD CRACKING NOISE FROM VICINITY OF F/O NR 3 WINDOW DESCENT TO 10,000 AND DEPRESSURIZED AIRCRAFT. MX NOTE: AS PER CREW COMMENTS AIRCRAFT DID NOT LOOSE CABIN PRESSURE DUE TO THIS INCIDENT AND AS A PRECAUTIONARY MEASURE AIRCRAFT WAS DESCENDED TO 10,000 FEET AND DEPRESSURIZED. RECTIFICATION: THE R2, 3, 4 AND 5 WINDOWS INSPECTED - NO DEFECTS NOTED THE FUSELAGE STRUCTURE INSPECTED. NO DEFECTS NOTED NOSE WHEEL STRUCTURE INSPECTED. NO DEFECTS NOTED R2 WINDOW OPERATION CHECKED. NO DEFECTS NOTED, R3 WINDOW BOLTS RE-TORQUED - 1/4 TURN REQUIRED TO RE-TIGHTENED SOME BOLTS NOSE WHEEL WELL PANEL BOLTS RETORQUED. ALL BOLTS FOUND TIGHT. AIRCRAFT IS SERVICEABLE. (TC NR 20091224001)