Well, since Catalina only has 1 or 2 deputies working at a time, the word to switch was most likely passed in person and maybe a phone call to the isthmus deputyL-TAC 2 has been down for two days now, so I'm guessing they are working on the South LA and Catalina repeaters for narrowbanding. Avalon Station was using S-TAC 4 yesterday, but today ran into some units using S-4 for a warrant search. Haven't heard them since and didn't hear an announcement for "switch to ____."
Seems relatively easy for ISD to go to each station and reprogram radios and repeaters... but OC can't do that to get fire comms in the clear. (*eye roll*)