Replaced the filter base. Took about 5 minutes with a 1/4 nut driver, #2 Phillips head screwdriver and 7/16 in wrench. Removed the cartridge, removed one screw to remove the cover. Disengaged two water lines from filter base using wrench to pry them loose. Removed 2 screws with the nut drivers to remove filter housing asm. Then removed 4 screws with the Phillips head screwdriver to replace the water filter base. Reversed procedures for re-assembly. Easy job!