Our 6 year old Bosch WTA 2000 Tumble Drier keeps
tripping it's heater cut out. Press it in and it runs ok (hot)
for a while then trips out again. The filter is clean and the
air vent at the back, which vents directly through the wall,
is clear. So I imagine its a duff sensor yes/no?

I haven't had the back off yet, but befor I do, does anyone
know if this an easy/difficult job?

Any other thoughts...
Many thanks,
Roy.