What was found
FALSE FIRE WARNING DURING FLIGHT. AFTER A/C LANDED, PILOT REPORTED INDICATION WAS INTERMITTENT. COWL WAS REMOVED, ENGINE INSPECTED, NO INDICATION OF FIRE/OVERHEAT. DETECTION LOOP INTACT/NO DAMAGE. WIRING CONNECTIONS AT FIREWALL DISCONNECTED, APPEARED TO BE MORE THAN NORMAL BUILD UP OF GRIME/CARBON. CLEANED TERMINALS/CONTACTS, RECONNECTED. GROUND RUN, UNABLE TO DUPLICATE FIRE INDICATION.