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 HVY CK FOUND CRACK FOUND ON VERTICAL STABILIZER TRAILING EDGE RIB 9/10. AAR MX REPLACED RIB PN 170-63629-001 IAW SRM 51-41-01, 51-41-02. SEE AAR NRC# 4500895-3000-0016 FOR WORK PERFORMED. AC REMAINS IN YQG FOR COMPLETION.