Did you increase the value of the resistor that was in series with the white LED? The bandgap voltage of an amber LED is lower than a white LED. If you did not, then the amber LED may be short lived.
Yep. It's drawing about 20 mA.
As the other fellow said though, if you wanted to, you could just install a larger resistance and keep the white LED that came with it. But at 13.8 volts, it was waaaaay too bright for my tastes. I mean it's supposed to be a SWR meter, not a searchlight. I just installed a different color so all the equipment I have looks about the same. I love color coordination. Call me the Martha Stewart of the ham world.