As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE C/W AMERICAN CHAMPION SL 406 RE: CRACKED SPARS. BOTH MAIN SPARS FOUND TO HAVE HAIRLINE CRACKS OPPOSITE THE UPPER INBOARD ATTACH BOLT FOLLOWING THE SPAR GRAIN. BOTH WINGS TO BE REPLACED WITH FACTORY NEW WINGS. 1974 CITABRIA 7GCBC 700 HRS TTSN. NEVER USED FOR AEROBATIC TRAINING. WAS USED BRIEFLY WHEN NEW FOR GLIDER TOWING.