Topband: K9AY beverage transformers - did I fry them?

[Dave NØRQ (lists)]

My IC-746PRO does not have a receive antenna port, so last season I
had to manually flip an antenna switch between xmit and rcv antennas.
(Yes, I know, I need to resolve that situation, one way or another.)

In the process, I inadvertently dumped some RF into my beverages, and 
am wondering if I damaged/ruined my K9AY beverage transformers.  (It 
was 100 watts briefly several times, and 1kw briefly once, into different units.)
How can I tell if they are functioning properly?  I disconnected them
and brought them inside, but the case is sealed shut, and I don't know
the correct way to determine if they still work.  Advice appreciated!

-- 
Dave NØRQ