My spare tire warmers are from a shop that had custom branded tire warmers built for them that they no longer sell or support. my rear spare has crapped out and only warms to about 100 degrees and wondering if there is anybody near by who is willing to take a stab at diagnosing and potentially fixing the issue or if they know somebody who would. they are pretty standard warmers with a digital thermostat. exact model as shown in pic. my electrical troubleshooting skills are pretty weak so i need some help. calling rod mattison or equally skilled electrical engineer....