As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - DURING CLIMB RIGHT ENGINE 'B' FIRE WARNING LOOP FLICKERED ON, SWITCHED TO 'A' LOOP. AFTER LEVEL OFF AT CRUISE. 'A' LOOP WARNING CAME ON AND WENT OFF. FOUND LOWER APRON 'A' AND 'B' LOOPS CHAFED. REPLACED 'A' AND 'B' APRON LOOPS, MFG P/N 5938323-505 AND 5938323-506, AND FIRE WARNING SYSTEM OPERATION CHECKED NORMAL.