What was found
D:L WINDOW HEAT CAUTION MESSAGE DURING CLIMB. RAN QRH MESSAGE CLEARED. RECEIVED MESSAGE AGAIN ON APPROACH / C: MEL 30-41-2 / CAT A DUE WITHIN 1 FLIGHT DAY / NOTE: MX ACTION C/W / L WINDOW HEAT CAUTION MESSAGE DURING CLIMB. RAN QRH MESSAGE CLEARED. RECEIVED MESSAGE AGAIN ON APPROACH (FILED CLOSED) REMOVED AND REPLACED LH WINDOW IAW CRJ200 56-12-01 AND TASK CARD 56-220-1000-SKY. OPS AND LEAK CHECK GOOD AT THIS TIME.