Hello britz, I have similar problem. on Tm800
I go to 13 deg and the motor runs back to 28.2 location.
What I do know, by using a different box on the same motorised dish, is that the problem is the motor.
mine is a technomate motorised dish and has a hardware reset sequence of :-
power off the feed.
hold east and west buttons together and power on (led indication when success)
didnt work on mine as the buttons plastic covers are hardened
so I changed usals from on to OFF then use the positioner to set each satellite manually.
do the farthest east/west first then count in/out
not easy but you will get somewhere
I hope