What was found
MOMENTARY SHUDDER AT FL 350 IN CRZ. SUSPECT NR 1 ENG COMPRESSOR STALL. CHECKED INLET AND EXHAUST. BORESCOPED NR 1 ENG PER MM. RAN ALL 3 ENGS PER PFHB, OPERATION NORMAL. POST-INSPECTION FOUND THE LEFT SIDE OVERWING AFT EMERGENCY EXIT DOOR WITH THE OUTER PANE OF DOOR WINDOW MISSING. EVIDENCE IS INCONCLUSIVE IF ANY PART OF WINDOW PANE WAS INGESTED. A NEW WINDOW WAS INSTALLED FOR RETURN TO SERVICE.