What was found
PRIOR TO FL 240, CREW RECEIVED INTERMITTENT INDICATION ON NR 1 SIDE FOR CHECK FIRE DETECTOR E1 AND B FAULT LIGHTS WITH CIRCUIT BREAKER K7 TRIPPED ON CAPTAINS SIDE PANEL. ELECTED TO RETURN TO DEPARTURE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND FOUND A CHAFED WIRE THAT WAS TOUCHING A BOLT IN THE LT WHEEL WELL, CAUSING THE FAULT. MAINTENANCE REPAIRED THE WIRE IN THE LT WHEEL WELL IAW AMM AND OPS CHECKED GOOD. ACFT IS GOOD FOR SERVICE.