I took my old, fully metal, very reliable Viking machine in for one small repair, and it's not run well since.  It seems they used a substandard lubricant which gums up unless the machine is in a hot room!  The charge was exorbitant as well.  I will be looking for another repair company.  Sally's in Mesa had a wonderful woman named Kay who did the best repairs and whose charges were very reasonable.  Sigh~