As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FUEL CAPS HAVE AN INTERNAL GASKET BLOWN OUT . NO EVIDENCE OF CONTAMINATION FROM BAD GASKETS WERE FOUND. REMOVED AND REPLACED RIGHT AND LEFT WING FUEL CAPS WITH NEW P/N C156003-0101 (8130-3) I.A.W.TEXTRON/CESSNA 172 SERIES (1996&0N) MAINTENANCE MANUAL REV. CHAPTER 28-20-00.