If you guys have a gun with a wasp handy, take a look at the port where the laser beam comes from.
Is it an open notch where you can see the laser emitter down in there, or is it just a pinhole or tiny window?
Mine is a squarish open port maybe 5 mm square, I can see a red wire in there, too.
It was beginning to rain yesterday and it is possible water could have made its way in there on mine.
I looked at all the pictures I can find online and none of them show this port, so I thought I'd ask someone.