As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACKED INDICATION MARKED 1.100"L L/H HORIZONTAL LOWER SKIN, 8.75" FWD OF AFT SPAR I/B OF STA. 147.90. GROUNDED - YES. REPLACED L/H HORIZONTAL LOWER SKIN @ STA. 147.90 IAW B737-NG SRM 55-10-01-2R-11. THIS IS A CLASS "B" REPAIR WITH AN INSPECTION THRESHOLD OF 56,000 TOTAL FLIGHT CYCLES.