Yeah very simple as Penquin has said, heater is located at bottom, held in place with clip & seal, check for faulty relay though, i think theres a relay that switches on the heater, i think the relay is located near the bottom where the choke is & cable comes in, (i think, not sure of this model), heater will cost close to £60 & relay would be £25, approx.. best of luck, nice machines to work on.