See image below showing the panel to remove, take out the old filter box and put in the new one, then reset the counter as below...

Power the machine OFF from the main switch leaving the sub switch ON.
Turn main power switch ON while pressing the Utility/Counter key. Keep holding it till the comes up in Service mode.
04 - Counter / Data
03 - Parts Counter
01 - Special Parts
03 - All Items
Highlight "Filter Box"
Select the "Counter Clear" button to reset the count
Select "Return Button"
Exit out of service