Ordered new infinity switch on Monday, it arrived on Tuesday!
Took cook-top out of counter, removed glass top and loosened the switch panel. Removed wires one at a time from defective infinity switch and put them on the new switch. Put the new switch into place and secured screws. Secured the switch panel, reinstalled the glass top, and put the unit back in place in the counter. Turned power back on and tested, OK!
Total time, about 20 minutes. Part of time just to make sure we were taking things apart safely and properly.