replaced fuser, worked for two weeks and now same error 980. I am a printer tech but never have I worked on these brands. I called support and they said there is no patch and I should take it in for service. I didnt tell her I was service. That was funny. Is there a common problem with these machines, should I clear NVRAM ? any firmware upgrades etc. ? Is it not shutting down the heater and blowing the thermal fuse etc.