Up mini bed temperature sensor failure

Hello everyone. Two of my printers (up mini), almost simultaneously, had a broken bed temperature sensor. In the slicer, it writes 60.42 (for both). By the way, my UP PLUS 2 connected to the same computer as the others works great. I’ve seen similar posts on Google, but unfortunately, they have already been removed.
Has anyone encountered a similar problem? Does anyone know how to fix this?

i’d start by determining if the issue is the pt100 sensor on the bed or main board. disconnect the heated bed and measure the resistance over the little pt100 resistor on the heater pcb? (assuming its similarly designed to the up mini 2)