GRIMREAPER
How long have you had this machine?
As your questions:-
"How do I perform a nozzle check?" and "How do perform a head soak?"
Should be a fairly routine procedure!
Seems a bit strange you can replace cap tops, wipers and dampers but can't do a nozzle check or head soak.
The big problem is if this has very recently happened it may be repairable at least to a point where the print is acceptable.
But if this has been going on a while no matter how long you soak the head or run clean cycles you will never get the lost nozzles back as they will be blocked.
Head soak is easy:-
Place a lint free cloth into the docking station and soak with cleaning fluid, move head back onto docking station, leave for half an hour, remove lint cloth and run a few clean cycles then try a test print. Repeat until you cannot retrieve any more heads.
Sorry for being a bit negative earlier but head soaking and test prints are common practice on any solvent printer.
Hope that helps
SC