What was found
CRACK ON LH ENGINE THRUST REVERSER AT LOWER INSULATION. DURING TRANSIT CHECK, IT WAS DETECTED A CRACK ON LH ENGINE THRUST REVERSER. MAINTENANCE PERSONNEL PERFORMED REVISION, DETECTING A CRACK OF 1.00" LENGTH, 0.828" WIDE ON LOWER INSULATION BLANKET, ZONE 2, STA. 241.5 AT LH ENGINE THRUST REVERSER; SO THE LH ENGINE THRUST REVERSER INSULATION BLANKET P/N 99A9265M, S/N 516555, TSN 31787, CSN 11701, MANUFACTURER BOEING COMPANY WAS REPLACED IAW AMM 78-31-13-400-806-F00, TESTED CORRECT.