10th KFC225 failure in 6 years

I've just had another one. Details at the bottom of this URL

http://www.peter2000.co.uk/aviation/kfc225/kfc225-1.html

(go to the "Update 25th April 2008")

Can anyone suggest what it might be?

Superficially it is a pitch trim failure but the pitch trim works
manually so the motor etc is OK. The pitch servo contains a strain
gauge which feeds a "I need trimming" signal to the KC225 computer
which then drives the pitch trim servo accordingly, and the fault
could be in this part of the system (a duff strain gauge).

I can get some refurb KC225 computers but these need a "certification
file" (basically, the TB20 aircraft parameters) and this seems to be
hard to get. If anybody has got this file I would appreciate it :) My
email is peter at peter2000 dot co dot uk. The filename is
18950000.CER

Honeywell have stopped making this product.
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