I have a GRP90WGR bought only a few months ago. All of a sudden I find that one of the plates (that are the heating source and have etched on them "Hot Surface! Don't Touch") have come loose. There are 4 hex bolts holding it on and it looks like the plate melted slightly around two of the bolts. Are there options to replacing this plate? There are screws at the outer portion of the plate (the hot plate is a plate attached (by noted bolts) to another plate.