As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE B LOOP LIGHT ILLUMINATED AS POWER WAS SET FOR TAKEOFF. TAKEOFF WAS ABORTED AND NR 2 FIRE BOTTLE WAS BLOWN. AIRCRAFT RETURNED TO GATE WITHOUT INCIDENT. MAINTENANCE FOUND RIGHT ENGINE A AND B LOOPS FAILED. REPLACED RIGHT ENGINE HARNESS/LOOP ASSEMBLY. ALSO, REPLACED NR 2 ENGINE FIRE BOTTLE. OPERATIONAL CHECK NORMAL. AIRCRAFT RETURNED TO SERVICE.