Ok, Here is swhat I did to fix my Pronto. I disassembled the unit. I completely removed the LCD screen, I CAREFULLY removed the black protective tape from the back of the display and with the aid of a microscope and small soldering iron , I reflowed the solder on the flexible circuit conductor.
Before I started I looked for fractured solder joints but I could not find any. They had to be there but I was not able to see them. I'll let you know how this works out,
but right now the Pronto is working better than it has for sometime. It had been sluggish for a month or so.

As far as doing this repair yourself. You have to have a microscope and a small tip in your soldering iron. This is not for a novice, even a person with years of soldering experience would find this challenging. I have worked with small surface mount pc boards for years and it was still tricky. If you can find someone to handle the soldering work I am fairly positive that you can fix this issue.
If not send me a email and we can talk. I don't really want a boat load of these things showing up on my door step. Hopefully this will be a good fix. Time will tell. Mike/KD9RG