Hey guys I lucked into great Craigslist find for stupid low money. Series 1 MB 115 combo amp. Silver face. I researched this model and it's rife with issue. Did this model turn out to have one defining issue or has it been all over the map? The guy I bought it from said the fan stopped working and the head would go silent. I tested the fan and it's okay. So far it's working like a champ for me. Appreciate your comments.