What was found
LT HORIZONTAL LOWER SKIN CRACKED STA 129, 11 INCHES FROM TRAILING EDGE. GROUNDED-YES. REPAIRED DAMAGE TO LOWER SKIN AT STA 129, 11 INCHES FWD OF TRAILING EDGE. REPAIR ACCOMPLISHED IN CONJUNCTION WITH DAMAGE AT STA 129, 18 INCHES FWD OF TRAILING EDGE, IAW B737-800 SRM 55-10-01-2R-11 REPAIR 11. FOR ALL PARTIAL WORK ACCOMPLISHED SEE MIG-5 OK195757 W/O 1018821 000/0013. THIS IS C CATEGORY B REPAIR W/AN INSPECTION THRESHOLD AT 56,000 TOTAL FLIGHT CYCLES AND 9,000 FLIGHT CYCLE INTERVAL.