As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRACKED WING SPAR WEB AT ATTACHMENT FOR RECIPROCATING FUEL PUMP ASSOCIATED WITH FLINT WING TIP AUXILIARY FUEL SYSTEM. VIBRATION ASSOCIATED WITH FUEL PUMP OPERATION CAUSES THIN SPAR WEB (.025 INCH) TO FLEX AND CRACK AT OUTSIDE RADIUS OF ATTACHMENT HARDWARE.