Help: Self-Test Error - Heater/Thermistor Not Connected
The thermistor should measure a resistance about 100k at room temperature using a multi-meter. It can be difficult to find the exact spot on the wire where the break is, but bending it and constantly measuring with multi-meter is the easiest way.
It can be soldered again, but no guaranty that it won't break again. You can get a replacement from Prusa Shop.
I think I'll order the replacement for peace of mind... thanks for the help!