I'm also having problems with my icemaker on my Whirlpool sr1155811 side-by-side. One night the freezer door didn't close all the way. There was a lot of water on the floor - since then my icemaker hasn't worked.
I tried your advice for replacing the water filter and testing the N & L for 120VAC. The T & H test didn't move anything, but I think it's because the ice tray is frozen solid.
I think the water feeding tube is blocked, but have tried a hair dryer unfreeze it. Are there any other tips for unblocking the water feeding tube?