On our Solera, there is a box covered with a black metal plate held on with two thumb screws on the left side of the steps. Says something like “do not open without disconnecting batteries”. Some breakers/fuses in there, I believe.
Also, I believe there are several inline fuses - have to search those out starting at the battery terminals looking for wires separate from the main terminal wires or tracing back from the steps. The steps are still powered when the disconnect switch is turned off, so must be wired separately.
2012 Solera "S"
Calif SF Bay Area