I found the heating element with no continuity and replaced it. what else is there for me to check.
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Replacement parts for Whirlpool DU1055XTPS4 UNDERCOUNTER DISHWASHER | AppliancePartsPros.com
The unit also has a hi-limit thermostat (Item 30 in Section 9), should be 0 ohms.
the high limit is good. the clean light flashes 7 times. is there a diagnostic code reference out there? are there any other limits or safety’s? all the wires look good