how can i fix myself white knight cl417 wv?

this tumble dryer is quite old about 14 years but hasn't ever had a problem until last week it starting cutting out after about 2 minutes ,i pressume a thermostate problem, i have tried pushing the reset button but it doesn't click and it trips the whole house, is this something i can do or do i call out a local repair man / lady , but dont want to be ripped off , have been in the past. or is it better just to condem it