Been there done that---They are lucky they are on the air at all! When that happened to an FM I worked at, the schrap got down in the line, we ended up sweeping the line, determined where this stuff had settled took a deep breath and cut the line. Luck was with us---there it was all charcoaled. We had enough hardware to do a in line splice, and got back on the air later that day. Between that and the bullet holes the line would not hold pressure, so we patched it up as best we could and started counting pennies for new line.
Not one of my favorite days....