Optoma HD70 DLP Projector "lamp approaching shut down" Questions

...shut down, lamp fail light came on, and only a hard power reset would let us try again.  The bulb was good; after all, it came on, right? So, we kept playing this game of power up, fail, unplug, ...

...shut-off Next most likely causes: bad fan motor or a failed sensor. Bad fan motor - fans can bog down if the bearings go bad; you may notice an unusual noise, typically a whining sound. Failed sensor ...

...shut-off Next most likely causes: bad fan motor or a failed sensor. Bad fan motor - fans can bog down if the bearings go bad; you may notice an unusual noise, typically a whining sound. Failed sensor ...

...lamp lighten properly but one msg comes as "Fan Failed" and it gets shutdown. A blinking amber TEMP light indicates that the projector fan has failed and the projector automatically shuts ...