[Old Veritas 8 alarm panel, lost manual, how to setup PART set Zones]

Hi, i fitted it over 20 years ago ! have been adding /replacing sensors as needed. alls been fine.

However i had a new fuse box fitted, now cant use the system as cannot get into programming mode or to setup which zones are part zones.

If i key in #### PROG i get rejected tone, same with #### PROG

But if i key in #### 00 or #### 00 the leds all come on, but then keying in 51 doesnt work

If i remember right, i didnt have to do that, i think it was just programming mode > key PART > led light up that are in part set., then select which ones you want.

But this doesnt work either, 

Any ideas or a manual ?