What was found
AT FLT 360, RECEIVED CABIN SMOKE LEVEL 3 ALERT. ALERT WAS INTERMITTENT ON AND OFF. WE ELECTED TO DIVERTED, ALERT WENT OUT DURING DESCENT. CREW REPORTED THERE WAS NO SMOKE PRESENT, ONLY INTERMITTENT INDICATION ON OVERHEAD PANEL AND EAD. PERFORMED SMOKE DETECTOR ADJUSTMENT TEST IAW AMM 26-14-01-5, NO FAULTS FOUND. PERFORMED THE MISCELLANEOUS SYSTEMS CONTROLLER ADJUSTMENT AND TEST IAW AMM 31-42-01-5, NO HISTORY, NO CURRENT FAULTS AND RTS WAS GOOD.