As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED WHEN APU WAS STARTED WHILE ON APPROACH, APU TEMPERATURE SPIKED AND THEN SETTLED DOWN. CABIN FILLED WITH SMELL OF FUEL AND FUMES. CREW SHUT DOWN APU AND SMELL DISSIPATED. AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED, REMOVED AND REPLACED APU AND PERFORMED CHECKS USING AIRCRAFT MAINTENANCE MANUALS. AIRCRAFT RELEASED FOR SERVICE.