somewhat sad tek4015-1

Hi, I pulled my tek4015-1 from storage (~10 years, dry but cold, had been working perfectly then) and brought it home to my living room, much to the dismay of my significant other. I plugged it in. it squealed a bit, zapped a little and lit up with that signature green expanding circle. I was able to get the line/local light to behave reasonably and it seemed to go into local mode ok. Was hoping to echo characters to the screen, but no love. The screen is really bright. It's as if the whole thing was in the lit-up state. PAGE key does blink the screen, but I remember it flashing brightly whilst erasing in the past. Now it looks like it's just staying bright all the time. I wiggled the boards in the cage around and managed to get it to repeat control-g feeps (while holding those keys down), but it's only able to do it intermittently, seems related to the positioning (or complete absence) of the display driver board. Still no characters showing up. Does anyone know how to work on these? thx jake