Does your tech have access to full service manuals? there are a huge ammount of tests you can do on the tyros 2. If he is an authorised engineer he can download the PDF file from YSISS. There is a seperate file for tests called Tyros2_TES.pdf.

The model number for Tyros 2 is: TRSMS02

It does sound like a cracked board (unlikely though unless you really whacked it) or a shorted data line. the latter is a piggy to find, sometimes its just the leg of a component touching somewhere it shouldn't and can be anywhere from the DM board itself to one of the control PCB's or even a cable that has perferated slightly or was trapped between panels during assembly.

TWD

[This message has been edited by Tonewheeldude (edited 02-21-2010).]