First, what happened to the P.S.? They are are usually easily repairable if standard unregulated linear supply, there is nothing much to them.
Otherwise there is someone on ebay that sells both custom transformers or the complete supply, Anatek ebay name Jonango.
What is the voltage rating of the motors?
If the motors are old units, make sure you check the brushes and commutators for wear.
BTW, many Brushless DC amplifiers can be used for brushed motors, this allows for later replacement of the DC brushed with DCBL, should they fail at some later time.
Al.
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.