shouldnt be hard im not sure what they call them now but its like a element mine had three at the back two had gone so no warm air. these are easy to replace my where like a spring dont get rid of your dryer call your nearest electrical parts shop give them make and model tell them no warm air they will order the coil/element shouldnt be more than £20 or so and have a go your self.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix tumble dryers.