What was found
PHX - ABORTED TAKEOFF - FLT 0445 - ON TAKEOFF AT PHX EN ROUTE FOR TUS RECEIVED AMBER LEADING EDGE FLAP IN TRANSIT LIGHT ON FORWARD PANEL WHILE FLAPS SELECTED TO 2 UNIT; REJECTED TAKEOFF AT 50 KTS. AFTER TAXI OFF RUNWAY AND SITTING ON TAXIWAY, THE IN TRANSIT LIGHT WOULD ILLUMINATE INTERMITTENTLY. MAINTENANCE TROUBLESHOT AND PLACED SYSTEM ON MEL 27-4, COND. 1 "L/E FLAP/SLAT FORWARD PANEL LIGHT INOP". ORDERED M229 MODULE FLAP/SLAT POSITION INDICATING ACCESSORY UNIT.