Hi...could anyone give some thoughts on what could have happened here...i went to check my grow room and found that 1 of the magnetic ballasts had some black charcoal looking burn mark on top of it...it was still functioning the lights were still on...could it just be dust finding its way into the ballast through the grate?...or maybe an insect crawled in there and got sizzled??...whats your guys thoughts please??...Thank-you...