or during taxi in on stand when the IRS's are put to off and airplane has not come to a complete stop yet, can also generate a warn elex. Aligning them again solves that. (can also be when aircraft is moved/towed between 2 flights)
99% of warn elex messages I had were solved by aligning IRS's
Switching IRS off during taxi in? Not really out of the FCOM this one.