As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AC WAS IN FOR HEAVY CHECK FOUND LT HORIZ STAB RIB 10 CRACKED (0.4000" LONG). REPLACED RIB PN 170-62571-001 ON REPUBLIC JC 170EO-55-10-0004_1. SEE AAR NRC 4500836-3000-0052 AND EO FOR DETAILS OF WORK PERFORMED. A/C REMAINS IN YQG FOR COMPLETION.