Doesn't sound good... I didn't have issues, although I replaced the power supply fan (nearly every fan...) with a silent noctua one and printed a new case cover. ;)
In my case it was the power supply. After I replaced it, the printer is now online & working. But, you are right fans are loud, could not run an over night print job :( May look into replacing fans. If possible could upload photos of fans you replaced?