The "Lock On" light is suddenly flashing. Tried to "cancel" & the dishwasher goes into drain cycle. Light goes off & then comes back on. Is this a mechanical problem associated with the door switch or a code Re-set? Thanks.

Look at this: https://dl.dropboxusercontent.com/u/...Dishwasher.pdf
It sounds like you need to adjust and tighten the door switch then re-check with your meter.