As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT WING AFT ATTACH POINT BOLT FOUND LOOSE WHEN MECHANIC WAS CHECKING TORQUE. AN96051B AND 516L WASHERS WERE WORN AND LOOPED. BOLT SHOWED ROTATIONAL O-RING BOLT WOULD NOT TORQUE DUE TO BOTTOM ON THREADS. INSPECTED ATTACH HOLE, OKAY. REPLACED ALL HARDWARE WITH NEW PARTS.