And then there is the goofy light problem. If you get two greens, now
what do you do?

I was told, if possible, pull one of the lights that is working and put
it in the one that isn't lit and see if it lights (this is for
locations where no one is on the ground to tell you if you have three
down -- but how would they know it isn't locked?).

I had that happen to me in an Arrow, and I was single pilot.. no pax.. and
the auto pilot was kaput.. I could not get my phat phingers around the
green lens cover to pop the bulb and move it... so it was back to the FBO..
a pass down the runway.. "well.. it looks ok.."... and the most ginger of
landings ever made... almost testing the gear while still maintaining flying
speed incase it crumped.. (right main light was out)... but that's what
5500ft runways are for

it was a light bulb problem... and no "press to test" for the bulbs..

BT