M13 muxes

I wanted to ask this on nanog, but I don't know that it's really on-topic 
there.

Are any of you using Widebank28 M13 muxes?  Are we doing something wrong, 
or do the voltage regulators on your controller cards burn out every few 
years?  We have enough of these in service that it seems like every few 
months (sometimes more frequently) we're having to drive to some remote 
POP to swap out controller cards.

Back when Carrier Access was still doing the repairs in-house, they told 
me the cards were dying due to capacitors going bad, and that the 
capacitors had an expected service life of 5 years.  Based on a visual 
examination of bad cards and refurbished ones, I think it's actually the 
voltage regulators on the front edge of the card...that the heatsink 
they're attached to is probably insufficient, or that we should have 
sprung for the optional front covers with fans in them.

I know Adtran makes a similar mux, and we bought a couple of them, but due 
to differences in the layout of the amphenol connectors for the T1s and 
the DC power jacks on the Widebanks and the Adtrans, swapping one brand 
for the other is non-trivial.

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