As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
L/H HORIZONTAL LOWER SKIN IS CRACKED AT STA 101 11 INCHES FWD OF REAR SPAR. GROUNDED - YES. REPAIRED LH HORIZONTAL LWR SKIN IAW B737-900 SRM 55-10-01-2R-11, REPAIR 11. THIS IS A CAT B REPAIR WITH A INSPECTION THRESHOLD OF 56,000 TOTAL FLIGHT CYCLES AND REPEAT INTERVALS OF 9000 CYCLES.