lubrication of walking matt

I have a read mill Vision fitness for 12 years

the original belt was replaced with a new one and I was told that it does not need to be lubricated
I have used it for about 5 years
I had it serviced recently to replace the motor and low board and not it does not work
it smells like burning and the motor hesitates

Service company says it needs lubrication and cleaning

But the motor wont run steadily and when I place a towel under belt to clean it there is not much dirt or rust
is there a matt that does not need lubricant or was I mislead ?

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