As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON INSPECTION OF HORIZONTAL STABILIZER, MECHANIC NOTED THAT ALL RIVETS SECURING FORWARD FLANGE OF RIB P/N 2632021-25 TO FORWARD SPAR WERE MISSING. HOLES WERE DRILLED THRU WITH BARE METAL SHOWING (NO PRIMER IN HOLES). ASSUMPTION IS THAT RIVETS WERE OMITTED AT FACTORY. THIS DISCREPANCY CAN ONLY BE VIEWED THRU ACCESS PANEL ON TOP, IB, RT SIDE OF HORIZONTAL STAB.