My russell hobbs RHM2018 has recentley stopped heating food. The microwave light still works along with turning of the glass table bottom inside the microwave which leads me to believe the heating element/part needs to be replaced. Can this be repaired with a new part? If so what is the part called and how much roughley would it be? If you can help please can you email me at tombrooksbank@yahoo.co.uk thanks Tom