[homedoctor]

Hi, I'm dealing with a Whirlpool GU2500XTPT3 dishwasher, and
would appreciate advice. The unit is about 5 years old and
worked well until several months ago. Recently we have been
finding bits of food and detergent grit on dishes on the top
rack. Bottom rack seems to be doing ok. I have flushed out the
feeder tube numerous times, made sure the top spinner and the
two spray arms are cleaned out and turning freely. Twice I have
found cherry pits or pieces of scotch tape obstructing two of
the channels of the inlet protector, but even after these were
removed, the problem persisted. The check valve and chopper are
both in great shape. I found an accumulation of mineral deposits
partially blocking the water inlet valve, so I ordered and
installed a new valve. This reduced the crud quite a bit, but
we still find tiny bits of food and detergent grit on the top of
dishes on the top rack and on the inside of upside-down glasses
on the top rack. The soils accumulator screens are all intact
and the accumulator has been cleaned out. We are using a rinse
aid. I have not investigated the motor separation screen since I
have no access to the rear of the unit without completely
removing it, although this can be done if necessary. I added a
gallon of hot water at the beginning of the wash cycle (LED 71)
and also at the beginning of the rinse cycle (LED 44) without
seeing improvement, so the problem doesn't seem to be caused by
lack of water.
The accumulator has a hole in its top shaped like a telephone
jack - see the Appliance Parts Pros.com Discount Appliance Parts – Appliance Repair Parts parts detail for the
accumulator assembly part number AP3609773. In my dishwasher
there is nothing in this hole. After reviewing the Wash/Rinse
Function description on page 9 of the KD-12 Job Aid service
manual, it seems to me that the hole would account for my
problem, since it would enable some soils to bypass the
accumulator screens. The Pump and Motor Parts diagram shows
nothing in the hole, although I'm thinking maybe the thermistor
would fit it. Can someone tell me for sure what fits into this
hole? If not, any ideas on how to get rid of the food/detergent?

Thank you.