Sounds pretty odd, Harriis, since error 81 is paper advance, not a carriage problem. If it took care of your problem I guess the error code was erroneous, and fixed is fixed. If, however, you develop problems again you might look here.
On the subject of lubrification (I swear, that's what HP calls it), you would think that it would be a straightforward process for HP to inform its owners how to take care of their printers.
Unfortunately, HP can't even seem to agree from one tech support person to the next as to the exact routine one should follow for lubrication. Users are educating other users instead of HP leading the way themselves. I'm afraid that HP thinks oil sounds messy and un-user friendly, so they try to softpedal the routine maintanence chores like oiling, wiping down the interior of the printer for overspray, and for me, at least, cleaning the printhead contacts for ink overspray as well.