speaking for myself its unlikely to have any value unless you have another machine of the same model no to repair and its old so getting rare
if it is F12 try
take the lid off and look at the wires going to the control panel. remove the plug from the board and replace it
F12 is a communication error between the 2 boards. it can be as simple as a bad connection. the top connection is the most simple to get at but could also be the other end on the power board. if it does not work and you wanted to go further you could try and locate the plug on the power board and remove and replace that
Dave