This excerpt from the user's manual can explain the problem of your mica sheet / waveguide cover.
"... Failure to keep the oven clean could result in surface deterioration, which could adversely affect the life of the appliance and possibly cause dangerous situations. Persons with STIMULATOR should ask their physician or the manufacturer for precautionary measures when handling microwave ovens. Safety To avoid electric shock The housing of the appliance must not be removed under any circumstances. the microwave oven settings are correct after you If the oven is to be integrated, when the oven has been started up To avoid overheating and fire in a kitchen cabinet, it is important to take special care when using the XXX EBR-5000 installation frame. This food with a high sugar or fat content, such as the frame, is available from your dealer...."
BLUESKY WD800EL25, WD800EL410, WD800EL4145, WD800EL4190, WD800EL41135, WD800EL41180
Manufacturer's part price is £10.91 Discount for bulk (starting at 10 units), £10.55 per unit
This manufacturer part is recomended by BLUESKY, which gives it a 10/10 rating.
This spare part is recommended for your BLUESKY WD800EL25 microwave oven .
All spare parts are new and come with a 1 year warranty
① Carefully check your BLUESKY microwave oven's product number
② Start search
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Here are examples for partial reference for microwave oven :
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