Hi just read your posting.Now in my experience on your model of machine when you get a burning smell it is usually the pump.When the machine is draining the water and goes to spin do you get a burning smell then?Please try to look underneath the machine to the front right.You will should see the pump with a red or black fan attached to it.See if has any evidence of corrosion or leaking.Please reply with additional information and I can guide you throe rectifying this fault.

My experience tells me that it would be wise to look for some part in the machine that is made of rubber, sometimes especially in their elder years the rubber warms up and gives a burning smell.
In fact it could burn so look for something made of rubber.