I noticed my green light isn't coming on anymore. I'm running 18 psi currently and the light was coming on at 10 now it doesn't at 18. Gain is at 7 per cal and hasn't been changed. Brand new pump with only 300 or so miles, as is the rest of the combo. Cal wl be here Monday the 18 th so I need all my ducks in a row. Any suggestions as to what I should be looking for? Thanks guys.