What was found
RIGHT WINDOW OVERHEAT LIGHT ILLUMINATED WHILE CLIMBING THROUGH 30,000FT. RAN THE CHECKLIST, TURNED OFF SWITCH FOR 5 MINUTES AND TURNED BACK ON, OVERHEAT LIGHT ILLUMINATED AGAIN. TURNED SWITCH OFF FOR REMAINDER OF FLIGHT. ACFT GROUNDED. TURNED RT WINDOW HEAT TO ON, OVERHEAT LIGHT DID NOT ILLUMINATE. RESISTANCE CHECK OF SENSOR & HEAT FILM WITHIN LIMITS IAW AMM 30-41-21. WINDOW HEAT SYSTEM TESTED NORMAL, SHOOK ON HARNESS & OUTSIDE TEMP OF WINDOW NORMAL IAW AMM 30-41-11, NO HISTORY PAST 90 DAYS.