[cobalt-users] 550 fan?

["Manny Tau" <mtau@xxxxxxx>]

My 550's Active Monitor state changes email says:
* One or more system components is running dangerously hot. One of the
system fans may have failed. Please check that the system has adequate
ventilation and that all fans are operating correctly.

Then 15 minutes later:
* The system temperature is normal.

During this time, then tool light is yellow, then goes off after the
"normal" message.

I've opened the 550 to check things out, and the fans seem fine, no real
buildup of dust, etc.

It occurs 3-4 times a month or so.

A glitch in a sensor, or a failing fan?
Anyone with this problem and know why it happens?

thnx, Manny