The repeater issue can be see resolved by multiple of ways.

1. Perform the cable test for those AP. If you are using the Meraki Switch then it would be much easier. Once the cable issue is fixed the AP would go to its normal state.
2. In most of the cases the AP configuration of allowed VLAN should also be check as well.
3. The Repeater mode can also be identified when the speed of the port auto negotiates to 100Mbps and the color of the AP goes to dark green in Meraki Switch.