toellner toe 7723 function generator repair (Potential EPROM Data Loss)

[lorenzo01]

Good morning everyone, about 6 months ago, I acquired a Toellner TOE 7723 function generator in mint conditions that a few days ago stopped working :-(
To be more specific, it would power on, display a number on the screen, and some LEDs would light up, but the keypad was no longer responsive.
After an extensive troubleshooting, I have come to the conclusion that there is absolutely nothing wrong at the hardware level (I even went as far as testing each chip individually by removing them from the board).
The only issue that comes to mind is that the EPROM memories may have lost some data over the years (presumably, the generator dates back to 1986).
So, I am asking anyone who has access to the firmware for this device to make it available
The image show the two EPROMs containing the firmware