As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT IN BASE MAINTENANCE: CRACK INDICATION FOUND ON RADIUS OF HORIZONTAL FLOOR BEAM 4 BACKSIDE OF THE SPAR VERTICAL STRINGER AT FR 36. CRACK L= 0.470 INCH. MAINTENANCE PERFORMED PERMANENT REPAIR ON HORIZONTAL BEAM -Y254 (NUMBER 4) LOC CENTER WING BOX FR36 FRONT SPAR IAW EA# 366899.