As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A SCHEDULED MAINTENANCE VISIT WHILE PERFORMING A HORIZONTAL STABILIZER ROLLER INSPECTION, THE LT AND RT IB HORIZONTAL STABILIZER, BOTH LT AND RT RIBS WERE FOUND CRACKED. DETAILED INSPECTION INSTRUCTIONS OF THIS AREA ARE OUTLINED IN MFG COMMUNIQUE' NR 70. MAINTENANCE REPLACED THE RIB ASSEMBLIES.