Kelly
first, best to unplug rig from antennas even when you have lightning arrrestors.? or be blessed by a switch that grounds antennas not in use.?
second, I am still thinking storm may not have taken out your ubitx.? yes try soldering something across that RF attenuator to effectively move it out of the circuit - let's hope it is this simple!? If this AGC is installed similar to the VK3YE - there are no ubitx connections changed - so I am doubting it is in the act.? I really think it may be something simple that has opened up.?
17 wpm - I would not fret your CW capability - this is nearly top end for straight key use.? plenty of QSOs can happen at that speed.?
73 Curt