As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND ROW OF RIVETS MISSING FROM LEFT AND RIGHT CHANNELS, FORWARD END TO ANGLE SPLICE. CHANNELS ARE LOCATED UNDER CABIN FLOOR JUST BEHIND WING AFT SPAR AND SUPPORT FLOOR PANEL. THE RIVETS ATTACH SPLICE ANGLE RUNNING UNDER AFT SPAR TIEING INTO FORWARD CHANNELS. RIVET HOLES WERE PRESENT IN BOTH PIECES IN CORRECT LOCATION. THESE RIVETS ARE PRESENT IN SIMILAR MODELS WITH EARLIER SERIAL NUMBERS.