So I have done a few LWII (HP Cartridges) wiper blade replacements and they work great!!! Basically all the HP and LWII cartridges by now need them replaced.. They stopped making them I think in the early 2000's... You wouldn't think they expire but they do.. Not the actual toner but the wiper blade.. I bought the new wiper blades and carefully replaced them and they worked like new!!! It's a bit of a process to pop out the 4 plastic plugs with 2 on each side to remove the top cover.. I would think the drums are ok.. unless exposed to light which would ruin them.. but they may eventually expire..

The process is basically as stated at this link:

http://www.wb6nvh.com/Laserjet/Laserjet.htm

Matt