RE: Switch testing method ?
Sorry! I don't trust any of the rx switches these days, even new.
Cut em out and replace with a 5 pin shorting plug and socket...the cost of the slide switch that the manufacturer uses is only in the range of about 40 to 50 cents if bought in volume. An that is all it's worth in reliability. IMHO they don't belong in a guided (R/C) missile (Aircraft)
That's my story and I'm stickin to it.