When a client calls me up with a support question and I can't seem to find the solution I contact Autodesk Support. Now Autodesk has two youtube channels dedicated to MEP support.
On the AutoCAD MEP and Revit MEP support side at Autodesk I often speak with two individuals to find the solutions to our clients problems. The two MEP support specialists at Autodesk have launched two channels on youtube called SupportAcadMEP and SupportRevitMEP
At those channels you will find answers to questions that had been asked through Autodesk Support. Check them out you will find the videos very informative and helpful.