What was found
DURING 8A-P CHECK IN TASK CARD J3770-818-02-01 (21) AT MEX STATION, IT WAS DETECTED SEVERAL CRACKS AT RIGHT ENGINE INNER THRUST REVERSER. MAINTENANCE PERSONNEL PERFORMED A REVISION, DETECTING A CRACK ON UPPER FIREWALL STA 247.40 AND WL 100; A CRACK ON UPPER FIREWALL STA 234.47 AND WL 127; A CRACK ON LOWER FIREWALL STA 250.47 AND WL 92; A CRACK ON LOWER FIREWALL STA 240.47 AND WL 70; A CRACK ON LOWER FIREWALL STA 276.47 AND WL 86; A CRACK ON LOWER FIREWALL STA 261.97 AND WL 86; A MISSING SEALANT ON LOWER FIREWALL STA 274.47 AND WL 75. THE WO´S 7234056, 7234057, 7234058, 7234062, 7234063, 7234067, 7234068, 7234069 WERE ISSUED TO PERMANENT REPAIR THE DAMAGES DETECTED. A SEALANT WAS APPLIED, IAW BOEING SERVICE BULLETIN 737-78-1082 AT RIGHT ENGINE INNER THRUST REVERSER. THE UPPER INSULATION BLANKET WERE REMOVED AND INSTALLED, IAW AMM 78-31-13. THE THRUST REVERSER WAS REMOVED, IAW AMM 78-31-01-000-801-F0. THE INSULATION BLANKET WAS PERMANENT REPAIRED, IAW BOEING SERVICE LETTER 737-SL-78-050-B, PARAGRAPH 3.1 AND THE RIGHT ENGINE THRUST REVERSER WAS INSTALLED, IAW AMM 78-31-01-400-801-F00, ALL CORRECT.