What was found
AFTER T/O, WHILE ALTITUDE 7000 FEET, THE PILOT FOUND TAILCONE UNSAFE LIGHT IS COMING ON, THEN AIRTURN BACK HOME BASE. DURING GROUND INSP FOUND LOCK CABLE IN INTERNAL WARNING SWITCH LOOSEN, IAW AMM 53-53-00 REPLACED CLIP AND REINSTALL LOCK CABLE OK, AND CHECK INDICATOR FOR TAILCONE UNSAFE LIGHT IS NOT ON.