I retract the 1999, they are 2000's.
clue is the 2000 writen underneath Bomber on the leg.
parts wise there isn't much to do, fresh oil is a good idea, the stanchions look dry enough that the seals are still in good nick and they don't look to have been feck about with internally.
adjustment of dampening rates is using a really look 10mm hex (they came with a long plastic one).
full manual is available here
https://public-repository.org/marzocchi/2000_Jr._T_130.pdf
if you do strip them be careful not to snap the foot nut.
not sure what else you need to know. they are pretty simple forks that were built to last the test of time.