get a pressure guage and re-verify the tech's findings on the reverse clutch pack pressure
it could be something in the control valve blocking the fluid flow on the reverse side?
The pressure issue can cause the transducer to throw a signal triggering the code and lead you in the wrong direction.
with electrical over hydraulic controls its not hard to confuse issues and think it could be electrical ;o)
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.