As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PDIS 617 26-10 7503 01DEC18 EWR OPEN U LOGPAGES:2733768 "FIRE DET 3 FAIL" BLINKS INTERMITTANTLY. AT TIMES SHGN 02DEC18 19:08 EWR REMOVED AND REPLACED NR 3 ENGINE UPPER TURB R LOOP A (DH4) FIRE DETECTOR AS REQUIRED IN REF TO AMM 26-11-03-4-1 FACT 03DEC18 06:58 EWR NR 3 ENGINE FIRE LOOP "A" OPS CHECK GOOD AND BITE TEST OF THE FIRE DETECTION CONTROL UNIT CHECKED GOOD WITH NO FAULTS FOR "A" LOOP ON NR 3 ENGINE AS PER AMM 26-11-02-5.