As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT# 3199 THE CREW REPORTED A STRONG FUEL SMELL IN THE COCKPIT WHEN STARTING THE APU ON THE GROUND OR IN THE AIR.MAINTENANCE PLACED THE APU ON MEL.MAINTENANCE PERFORMED CLEANING OF THE APU COMBUSTOR DRAIN CHECK VALVE.OPERATIONAL CHECKS WERE GOOD.THE AIRCRAFT WAS RELEASED FOR SERVICE.