My '23 ZR2 is throwing the Service Axle Lockers alarm on the display now, too. It's been at the dealership 4 times now. I'll update when I get more info...
UPDATE:
On the first trip, the dealer first tried "reconnecting" the connector... which actually worked for about an hour of driving.
On the second visit, the dealer had me come in so they could justify buying a new connector... which needed to be delivered the next morning.
On the 3rd trip, before they started, the tech realized that they also needed new "seals". I assume the sensor/actuator cable passes into the rear diff.
On the 4th visit, (last Friday) the service writer told me his tech started puking so he went home sick... thankfully before he even moved my truck from the lot. BUT...
On the 5th visit, they replaced the connector AND the actuator(s) for the axle lockers. I suspect the "puking" excuse was to cover for the fact that they actually realized they needed more parts and didn't want to admit that the 4th drop off of my truck was completely useless. Just like the 3rd drop off.
Whatever. As of now, it has gone more than 24 hours without the Service Axle Lockers alert. The tech also noted that the factory wiring was "crazy tight" so that might be the root cause if anyone is having the same issue. Hope this is helpful for the crew.