Mike
While there is no clear concensus on details, there seem to be 2 key elements. First, reducing leakage around the low pass filter relays. One method is adding a set of relays on a daughter board so the input and output of a filter does not pass through the same relay. Second, added rejection at the 45 MHz filter stage, such as adding a crystal stage. In my local club we are doing a group build, and currently have supplied the materials for these mods. We should have sound data on a reproducible fix that hopefully some merchant will kit.
The transmit chain isn't ideal but we don't see urgent need to repair it.
Other basic mods need not be elaborate. see nd6t agc circuits for example.
I also doubt this is a cheap path to an all band 50 to 100 watt rig, but perhaps a few band PA might he reasonable. I hope a reasonable HF rig opportunity comes your way.
Curt
