Squeak:

It is possible the fix would not be so expensive. I recently had my Tyros serviced at a dealer about 2 hours away. They found some bad solder joints that required dismantling the entire instrument. The repair was $75 without shipping. If it is just an open ground, it might be trivial for a qualified tech to do.

I suggest you contact Steve D and ask him what he suggests (local service person or the factory). He was very helpful in my situation.

Michael