Dave, I have a 03 GT 346 with the same panel. I've recently developed a problem with the entire hydraulic system that operates my slide and landing gear. I spent a good three hours yesterday changing fluids, and tracing wires. I'm looking further into this, but here is where I am so far. The e-mail I've used to contact the company is
info@powergearus.com they have been extremely helpful with sending manuals in pdf format and even spent a bit of time on the phone with me to help me through some of the symptoms I'm experienceing. The manual touchpad is in fact no longer made, they recommended finding an electronics repair shop to drop it off to for repair. PPL Motorhomes does have them in stock under part number 48-9918 for $547.00!!!!! Basically, obsolete part that is worth more than its weight in gold! So I'm now on the hunt for a TV/Appliance repair facility that might have a line on the parts that make up this circut board...