My MPS service has two steps...and it is detailed on my wiring harness website, at the link in my signature below.
The first step is to evaluate the MPS for function. I test and document an MPS function to see if it works and what its calibration is. I can do this to either stock, untouched MPS units or ones that have been tampered with. If an MPS is not serviceable, then its junk.
While I dont rebuild them as yet, I am R&Ding the diaphragms as we speak, the main part that needs replacement. I am making good progress on this effort.
If the MPS is good, then I can calibrate it to known good settings for stock engine configurations for another small fee.
Between Geoff, Gary and me, we should be be able to take care of any MPS needs anyone has. None of us make a living at it...just another way to give something back to the 914 community.