Kitchen aid KUDS35FXBL9.

Lower spray arm is hitting the "Valve-Inlt" in the back of the washer going to top sprayer - so it can't turn does not turn.

Could it be cantered to the back? - or arms "drooping? not level? Tight on lower hub, which is loose in the (Cap, Internal Rear Feed?) assembly. Would have thought the pressure would lift it, but apparently not. On disassembly, no noticeable wear on any parts

Cleaned chopper (pretty clean anyway) cleaned all pipes, filter. Plenty of water, pump seems OK, top arm has pressure/spins. On fast open, lower arm has spray, but not moving.

Suggestions?

Thanks. Bob