VAX 4000-200

Hi I'm now the lucky owner of a Vax 4000-200. Apart from a bad TK70 drive (which I can get repaired in the UK ) Its fully working with 3 x RF 500Mb Drives (Two in a separate BA215 box) It boots VMS 3.2 and loads the network software. I even have all the license numbers for VMS 3.2, DW-MOTIF,TCPWARE, VAX CLUSTER & VOLSHAD What I don't have is the System password. The system was made in 1991 and had been out of use since 1998.00 I would like to preserve it as is, adding a contempory set of periperals (VT-100, LA-36 and so on) I don't want to replace the VMS or any of the other software. I have no option but to try and recover the system password. I'm not a hacker and have no idea how to go about breaking in. Anybody out there have any suggestions as to how to get in and recover the System password? Rod Smallwood