I have had my Merrimack for about 14 mos. Has been working great and we love it. Last nite the blower stopped working. The intake was really clogged and we unclogged it and it still doesn't work. The manufacturer never said anything about cleaning the intake in the owners manual. We ordered a new blower fan, it will take 2-4 weeks to arrive. Has anyone replaced one themselves? How hard is it? I tried taking off the lower grate to get to the fan motor, but the screws are in so tight and I don't want to strip them. Has anyone had this issue before?