As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEVEL 1 FIRE DETECTOR 1 FAIL ALERT FLASHED INTERMITTENTLY FOR NEARLY THE ENTIRE FLIGHT, BEGINNING PASSING APPROX FL280 ON INITIAL CLIMB AND RECEIVED AN AURAL NR 1 ENGINE FIRE WARNING ON SHORT FINAL. NO FIRE LIGHTS NOTED. VERIFIED WIRING FROM FDCU P1-1690A AND P1-1690B TO R5-817 AND R5-237 IN CAC. REMOVED AND REPLACED THE RT THRUST REVERSER LOWER FIRE DETECTOR ASSY IAW MM 26-11-03-4-2, NR 1 ENGINE B LOOP OPS CHECKED GOOD.