Had a call on one of these the other day running a high temp warning. Customer has blown out the heat sink with nitrogen but it doesn't help. We removed the back plate and brush cleaned the heat sink and then vacuumed it out. Put it back together and the cooling fan would not run. Pulled a fan and capacitor out of an abandoned drive(identical size) and put it in this one. The fan came on and ran but I left shortly after. A few days later I came back with a new fan assembly and capacitor for a backup and the drive is in alarm again for the same thing. Anyone know what the max delta t across this heat sink should be? Any war stories on similar problems that may get me in the right direction? Thanks.