We have noticed that the tower Ifan values are getting rather large (more than 60mA). Here is the plot over the past month, where especially 42 and 49m (of course 
) are at times running significantly higher than the others. The only <possible> action that we could take would be to turn them off to conserve potential run time on the fans. However, stopping the fans might allow stuff to build up more and humidity to do more damage (since the fans wouldn't be warm). Furthermore, the sonic temperatures appear to be <reasonably> close to the TRHs, so if a sensor dies, a tower temperature profile could still be constructed.
Thus, we won't take any action here and hope the TRHs last. At the rate they are going, they should still be under 80mA for another month. (If not, the current threshold could be raised.)
