What was found
AT POWER UP FOR TAKEOFF, AFTER ABOUT 15 KTS LT TR UNSAFE CAUTION MSG CAME ON. ABORTED TAKEOFF AT 30 KTS EXITED RUNWAY, AT MX REQUEST ON TAXIWAY PUSH POWER UP TO 60%, NO MSG, THEN CYCLED TR WHEN LT TR WAS OFF, THE LT TR UNSAFE CAUTION MSG CAME ON AGAIN, THEN OFF. DEFERRED LT TR IAW AMM 78-30-00 MEL 78-30-1, PLACARD INSTALLED. R & R LT TR ICV IAW AMM 78-32-09. OPERATIONS CHECKED GOOD & LEAK CHECKED GOOD. CLEARS DM, PLACARD REMOVED & MM02 UPDATED.