Dryer is now showing error code E68. I tried to enter the test mode by pressing START & CANCEL for 10 secs but no reaction from the dryer. Since the error code appears to indicate a key being stucked I worked all the keys and none seams to be actually stucked. I noticed that pressing the DRYNESS key didn’t result in the dryness actually being changed as per LED indicated.
It sounds like you have found the problem re: "I noticed that pressing the DRYNESS key didn’t result in the dryness actually being changed as per LED indicated.".
I would say that this is the bad key.
I do not know what part to replace control board or the keypad if it uses a separate keypad and control board.