As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: RIGHT HAND HORIZONTAL STABILIZER AT THE LOWER SKIN HAS A VISUAL INDICATION OF A CRACK ALONG THE RIB LINE AT STAB STA 120.30 LOCATED 18 INCHES FROM THE AFT SPAR. FABRICATED DOUBLER REPAIR AND INSTALLED PER 737-800 SRM 55-10-01 REPAIR 11 REQUIREMENT, FIGURE 2.