Chainsaw Repair

It's a pioneer/partner 5000plus. It is the same as a partner 5000. This was one of partners contributions to the p/p collaboration by electrolux right before they eliminated both brands so it would be the latest version of that saw platform produced....I think.....electrolux may have released a pp325? later + I believe the jred 490? as well but I don't know when the production on these ended. Late 80's? Please anybody feel free to correct me...