Our regional Mazak Service Department recently faxed us Mazak Service Bulletin 0989-002, dated September 19, 1989, and entitled "How to Re-Initialize a T2/T3 Control". Prior to receiving that, we were exactly where you are - totally without the simple secrets of re-initialization.
After the fax, it took about 5 minutes to fix get the NC up and the errors eliminated.
From our interaction with the Mazak Service people, we came to believe that this service bulletin was on the company server. Hopefully, the same exists for your T1 control. Obviously, it would be worth the effort to contact Mazak Service; they provided the above mentioned Service Bulletin to us without charge.
Mazak Service is pretty well swamped vis-a-vis the great number of Mazak's in usage and the enormous variety of machine's that their service people must know about. My guess is that they are now happy to assist people with older machines to fix things themselves.
And time has moved on. When the T1 came out, most users were intimidated by NC controls, dip switches, and terms like "parity error". Today, all that has changed. Today's user has likely grown up with considerable hands-on computer and digital hardware/software experience. There is no need to keep Re-Initializing Procedures secret nor charge for them, when today there are grade schoolers who could understand the procedures and put them in effect.
