Hemco inc. at 3938 E Pima st. can do a bench check as well. Give them a call at 881-1108, they have always treated me right.
Like Mark mentioned, If you need a new motor, a 3 ph with VFD control is a game changer. Some real sweet deals on NOS motors on eBay.
I also agree with what others have stated about checking ALL your connections. When Mark and I did the conversion on my older lathe, I was surprised at how many loose connections,mounts etc where loose. If it turns out your motor is dead then its time to make "lemonade" with the lemons life has tossed your way. I'm in no way an expert, but PM me if I can assist you. Mark's offer to check your caps is a great start as well. Mark's abilities are impressive, and he's a cool guy to boot.