Bosch Dishwasher SHU99226 - Drain

Bosch Dishwasher SHU99226 - Drain Pump runs constant.
Had water back up in dishwasher and overflow. That's fixed
and now drain pump run constant. Cleaned all water out of
sump, took dishwasher out of cabinet and turned on it's side, more water ran out (something about a flood switch?)
There is no more water in dishwasher! Pump still runs constant. Don't know where float switch is or how to get to
it.