What was found
ORF - FLT178 - DURING CRUISE, EN ROUTE FROM CLT TO BOS, THE NR 1 ENGINE CSD HIGH OIL TEMPERATURE LIGHT ILLUMINATED. THE APU WAS ALREADY ON MEL, SO THE CREW DISCONNECTED THE NR 1 ENGINE CSD AND DIVERTED TO ORF WHERE THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. NO EMERGENCY WAS DECLARED. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE CSD PER MM 24-11-11-4 ALONG WITH THE OIL COOLER PER MM 24-11-21. OPERATIONAL CHECK AND LEAK CHECK GOOD. CLEARED APU MEL 49-1 WITH THE REPLACEMENT OF THE APU M280 MODULE. OPERATIONAL CHECK GOOD.