[Elecraft] K144XV finals protection?

[John Webster]

What level of protection does the K144XV (internal K3 2m transverter)  
have for its finals,
with respect to high SWR and temperature?  Fold-back?  Shutdown?

I accidentally transmitted into my G5RV for a brief period (FM) with  
no apparent harm.  I can still
raise the repeaters:)  Just want to be properly informed.  I can find  
nothing about this is the manual
or archives.

Thanks & 73

John, N6JW