The FANUC A06B-0141-B175 is indeed a very rare servo motor manufactured by Fanuc. This particular AC servo motor belongs to the ALPHA series of drives and motors. The model is a aC12/2000 and its particulars are a straight shaft (no key); fitted with a 90VDC brake and absolute encoder feedback via a 17 pin connector.
Various services are offered on this motor. Assuming in stock for either outright sale or immediate exchange; DNC offer a 12 month warranty on all of our repair/sale services. If you are unsure what is at fault either your drive or motor then we can inspect and test either or both. Call us with your fault information.