I replaced the lower spray arm assembly seal a few months ago because the assembly was wobbling (the seal had come apart). The arm assembly still wobbled a bit, but output was okay and dishes were being cleaned properly. The wobble has gotten worse and now there is very little output from BOTH upper and lower spray arms. Any help would be appreciated!
Without being there it is hard to say what is wrong.
Remove the spray arm and check the spray arm it self and the upper and lower bearing/seals and check them for wear.
Click on the pictire for better views.
Upper
AP6008201
Lower
AP6013837
Spray Arm
AP6012274
Could be the pump is not centered
AP6007535
The following may also help
https://secured.whirlpool.com/Service/SrvTechAdm.nsf/2cd44500d572193285256a45004fd9d6/3e7e820d0030640f85256ab000567212/$FILE/4322455.pdf