Vax-11/750 diagnostic tapes

I am trying to get a Vax-11/750 running. I have a box of TU58 tapes that are marked 'diagnostic tapes'. The tapes appear to be used by Dec field technicians, since the tapes are marked 'Property of DEC'. The label on the first tape is as follows: BE-S0290-DE TU58 #1 11750 MICRO DPM PROPERTY OF DEC (C) 1981,83 What do I need to do to execute these diagnostics? Specific commands would be very helpful :-) I have not come across any references to these tapes in the limited documentation I have found. Do I need to boot from the console tape and then boot from the diagnostic tape? As you can probably tell, I am somewhat lost at the moment. I want to ensure the basic machine is running properly before I hook up a disk drive. I have a RDM card that is not currently installed. Is it better to use the diagnostic tapes, or, use the RDM card to detect hardware issues? PS. I am also fixing the gooey roller on the TU58 drive, what type of Tygon tubing do I need? ;-) Thanks! --barrym