I don't know a great deal about microwaves but always manage to fix most things. I have repaired microwaves when the fault turned out to be the micro switch that senses when the door is closed. Adjusting the door to align better in the lock cured the fault. Micro switches can be very temperamental try shutting the door hard a few times then apply pressure to ensure door is shut tight and start microwave. Make sure power is getting to the microwave. If you have to remove your microwave I would assume the manufacture would allow for removal. Try removing any visible screws and trims. Hope you can get it sorted. Sorry I cant be of more help.
If your Swift kitchen us like ours then the wood surround above the microwave is screwed in through the cupboards either side. Unscrew that and you'll see a plywood sheet holding the microwave down. Slide that out and you can then lift it up and out (don't forget to pop the plug through the hole in the side of the cupboard).
I replaced ours two weeks ago with a cheap one from Asda. I created a new set of plinths to hold the feet, moved the plastic slides for the plywood holder down to fit then flipped the original wood surround upside down.
More space around the replacement should improve heat removal.
The cooling fan in the original died so it cut out after about two minutes if use.
I bought a cheap one from Asda (George brand) last September,the base where the dish rotates rusted out in less than 5 months.
They refunded the money no problems as I still had the receipt.
saxo1