I just changed the interior bulb on my 6 year old hotpoint Mistral FF72 f/freezer.The bulb exploded and the f/freezer stopped working.I have checked and replaced the 13amp fuse in the plug but there is still no indication power is getting to the f/freezer.I contacted Hotpoint who are sending out an engineer in a weeks time.Call out £89 not including cost of parts.Could anyone please tell me what the likley cause is for the f/freezer failure and is it going to cost effective get the Hotpoint engineer out.Thanks.