My 2001 Beaver Contessa has an Acme dash air system with a speed control switch for Off-Low-Medium & High speeds. It now runs only on High speed. Believe on high it is 12 vdv direct and resister controlled on Low & Medium speeds. Does anyone know where this resister assemble might be located on my 2001 Contessa and what I should be looking for to find it? I suspect a resister or resisters are bad causing no blower operation on Low & Medium.