What was found
CRACK FOUND INBOARD OF STAB STA 138.70, 8" FOWARD OF REAR SPAR. MARKED. GROUNDED - YES. CUT OUT DAMAGED AREA IAW B737 SRM 55-10-01-2R-11, LOCATED AND DRILLED REPAIR DOUBLER AND FILLER IAW B737 SRM 55-10-01-2R-11 ALODINED PRIMED REPAIR DOUBLER AND FILLER IAW B737 SRM 51-20-01 AND SOPM 20-43-03. INSTALLED REPAIR DOUBLER AND FILLER IAW B737 SRM 55-10-01-2R-11. APPLIED TOP COAT IAW B737-800 AMM 51-21-99/701. THIS IS A CATEGORY "B" REPAIR WITH AN INSPECTION THRESHOLD OF 56,000 TOTAL FLIGHT CYCLES WITH INTERVALS OF 9,000 FLIGHT CYCLES.