As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT FL 270, 25 MIN INTO FL, LOWER AFT BODY O/H LIGHT ILLUM INTERMITTENTLY FOR APPROX 1 MIN, THEN STEADY. C/W POM PROC AND LIGHT REMAINED ILLUM FOR 15 TO 20 MIN WITH NR 2 THROTTLE AT IDLE. AFTER 20 MIN WITH NR 2 THROTTLE AT IDLE LIGHT EXT WITH A COUPLE OF FLICKERS, THEN OUT. FLIGHT DIVERTED TO ATL. FOUND CUT IN DETECTOR LOOP. REPLACED LOOP, OPERATION NORMAL.