generally all the Marzocchis need is to be cleaned, and change the oil every few months, depending on how much you ride. As they are a full oil bath, there is no grease to change, and just about all contaminants get flushed out with the old oil.
you used to be able to download comprehensive manuals for Marzocchi forks 2002 and before from
www.marzocchimtb.com .I just had a look there and got the 'site under construction' error, so they may be updating their manuals(I hope). Otherwise the MXC ECC would probably be the closest model to yours.
HTH