During the wash stage there is a loud grounding sound while the washer is agitating the clothes. It almost sounds like the teeth of a cog missing and it doesnt seem like the machine is agitating very much. Where would I start?
You will want to pull the agitator out and the inner tub out and check the splines on the shaft and check to make sure that there is nothing caught under the tub. Make sure that the agitator is not damaged on the inside. If these check ok then the bearings would most likely be the cause of unit not operating.
About half way through a cycle I get an F54 error code. I replaced the pump (which had a small leak). Again, I got the F54 code. I noticed a brown "scum" on the exterior of the rotor. Where should I look for a leak up there?
If you are getting a brownish scum on the exterior of the rotor then you will want to look for the tub bearing for the leak. If the tub bearing is leaking then you will need to replace the bearings W10435302. If the the bearings have to be replaced you will also need to get the bearing tool.