As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON DESCENT INTO BTR, CAPTAIN ATTEMPTED TO START APU. EXPERIENCED 3 HUNG STARTS OF APU. AFTER THIRD START ATTEMPT, CAPTAIN EXPERIENCED AN APU FIRE WARNING MSG ON THE EICAS. A/C LANDED AT BTR WITHOUT INCIDENT. UPON INSPECTION AFTER LANDING, THERE WAS EVIDENCE OF SLIGHT CHARRING ON THE A/C SKIN AFT OF THE APU ACCESS PANEL.