I continued to put up with the problem, and it continued to get worse and worse...to the point where I could almost not read the display and had to rely on HRD and a CI-V interface to read some functions and frequency on the computer in the shack.
In recent years, a ham Richard Rosenberger PA7FA in the Netherlands designed a replacement display for it. You can see his display kit at http://www.pa7fa.nl
I was about to send the front of my rig to him to have his new display kit installed (I couldn't possibly handle all the SMD soldering and such), when I got a message from Bob wa8ulw stating that he had an old 756 that had been struck by lightning and that it had a good display. Wow...was I ever relieved to hear this!
Bob and I worked the deal, the faceplate assembly from his 756 arrived at my doorsteps this morning, and it's already on the rig and looking good as new. While I was doing the work, I modified the 756 to add the use of the 60m ham band to it's range of transmit frequencies.