I just picked up a used Crimson Mesh kit a couple weeks ago. Got it pretty cheap as the previous owner broke the 10" tom. He had been using it as a snare and it quit functioning properly, so he put the whole set up for sale on eBay. Got it for $500 (including shipping)
I looked at the instrumentalparts website to get a replacement 10", but they only had a 12" tom/snare. It was $103, so I figured, "why not?".
I then took apart the 10" to see if I could figure out what was wrong. Cleaned it, put it back together and it worked slightly better, but still really poor response w/ low volume.
Contacted Alesis parts, they directed me to service. Service advised replacing the whole 10" tom for $107 through their parts department.
Well, I wasn't about to admit defeat yet, so I took it apart again. I didn't have a right-angle screwdriver to get at the screws holding the innards on the base, so I improvised. I drilled holes in the sensor plate to get the screws, took the outer sensor plate loose enough to get to the inner plate screws.
Bottom line, it appears that the wires to the inner sensor sheared from movement differential between inner and outer plates. I'll have to break out my soldering iron and see if I can fix it.
Meanwhile, I just acquired a Crimson II module at Goodwill for $140. Considering that I had seen them previously on eBay for $300-400, I figure it was a good find. It didn't have cable snake or power supply, but I already have those for my 1st-gen Crimson module.