What is your goal ? Are you trying to return the machine to 100% OEM as it came ? Back then a 19" monitor was huge & almost nobody had them.
Finding a manual may be damn near impossible. We did quite a few &
believe it or not a manual ran from $50 to $100
Any left at NEC
parts would have been junked by 10 yrs.
Add to that they were NEVER meant to be repaired to component level.
Purely physically unservicable for the most part.
Only thing I can think of is going to the places that do the actual
recycling & putting a bounty on one. Money does talk. I went to one
10 yrs ago & there was a huge warehouse full of CRT stuff.
73 Zeno
LFOD !