As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
JUST AFTER ROTATION, APU FIRE WARNING ACTIVATED. RAN QRH, INDICATION PERSISTED FOR A FEW MINUTES AFTER BOTTLE DISCHARGE. APU FIRE FAIL & APU FIRE INDICATIONS PERSISTED INTERMITTENTLY THROUGHOUT FLIGHT. FOUND LOOSE DUCT TO UPPER ATTACHMENT OF APU LCV. REATTACHED LOOSE DUCT PROPERLY INTO CLAMP IAW THE IAW AMM 49-51-01. OPS CHECKED GOOD.