TRL is limited? they offer most classes twice a month.
There is also maritime institute in point loma, however I am not privy if they have the refreshers and/or revalidation courses.
in general they focus more on the lower level stuff though, but it wouldn’t hurt to check with them.
you can get advanced firefighting on the navy base with military sealift command however i have heard its become hard to get that class, because they need to take msc sailors first. el camino college in torrance offers some classes but its hard with them to get their minimum required students.
i have been to both trl and maritime institute and I would prefer trl. they have their shit together a little better IMO.