OK, took the whole dishwasher apart. Got the pump and motor out. Went thru everything I cannot find any clogs or loose parts. The only area I can't really inspect is enclosed in plastic where the loose particles go thru the grinder before discharging. I've spun the grinder and doesn't feel hung up or catching on anything. I guess at this point it's the motor itself making the noise? Just to recap no noise when filling and draining just when wash cycle is on. Is this normal/uncommon for an electric motor to make a loud grinding noise but still seem to function OK. Dishes are coming clean and everything just load as heck when washing.