As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PERFORMED PRECAUTIONARY SHUTDOWN NR 4 ENGINE DUE TO INTERMITTENT FIRE BELL AT TOD 0:22Z DISCONNECTED CSD WINDMILL OIL PRESSURE 3 PSI. REPAIRED BARE WIRE TO LOOP AT 1 O'CLOCK POSITION TO TURBINE SECTION. RAN NR 4 ENGINE FOR 20 MINUTES AT CRUISE POWER, SYSTEM CHECKS NORMAL.