Here is a short video on how to install the MS810, MS811 and MS812 maintenance kit, fuser, roller and reset the maintenance counter.  This video covers the installation of the following Lexmark parts.  The parts are linked to our online store if you need to order them.
40X8420 maintenance kit for MS810 MS811 MS812 MX710 MX711 MX810 MS812
40X7743 fuser kit for MS810 MS811 MS812 MX710 MX711 MX810 MX812
40X7582 transfer roller
40X7593 pickup roller
40X7713 separation roller
If you see any of the following messages it’s time to install a new maintenance kit:
80 Replace maintenance kit
80 Maintenance kit — end of life
80 Maintenance kit — late warning
80 Maintenance kit — low
80 Maintenance kit — nearly low
81 Roller kit — end of life

Order these parts online at FastPrinters.com