What was found
R2 WINDOW LIGHT ILLUMINATED SHORTLY AFTER TAKEOFF. RAN QRH, R2 OVERHEATLIGHT CAME BACK ON A SECOND TIME AFTER ABOUT 10 MINUTES. LFT R2 WINDOW HEATSWITCH OFF REMAINDER OF THE FLIGHT. GROUNDED - YES. PERFORMED WINDOW HEAT SYSTEM OPERATIONAL TEST IAW AMM 30-41-00-710-801. ALL OPERATIONAL TESTS SATISFACTORY WITH NO DEFECTS NOTED. CYCLED R2 WINDOW HEAT MULTIPLE TIMES. COULD NOT DUPLICATE FAULT. AIRCRAFT IS OKAY FOR SERVICE AT THIS TIME.