As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU FIRE FALSE ALARM ON ROTATION APU FIRE ALARM LIGHT AND BELL FLICKERD ON/OFF/ON/FF W MORE STEADY ALL FLT PERFORMED GVI IAW BOEING 737 AMM 26-15-01-210-801, NO FAULTS FOUND. PERFORMED APU FIRE DETECTION OP TEST, IAW BOEING 737 AMM 26-15-00-710-801 OP TEST GOOD.