You an check for gross shorts or opens with the diode test function on the
finals too. I would imagine they might fail short rather than open. Do
they get hot, even with low power output? That would be a short. Of
course, if open, they might act as a capacitor and pass some driver power to
the antenna connection.
Just be sure any meter you use has low current if acting as a ohm meter for
testing. And voltage. Modern DMM's are probably safe for finals and
drivers.
Might be reluctant to use an old AVO meter VOM to test in today's transistor
circuits.
A surely safe test for a final, is to check the source or emitter resistor
DC voltage drop. If there is a voltage drop, it is handling some current.
If no voltage at the resistor high side, the device is open.
73,
-Stuart
K5KVH
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