In the Q & A section of the September issue of PC a reader reports that the indicator light on his Thetford cassette has stopped working and has been told the batteries may need changing. He asked for the location of the batteries. The reply makes no mention of battery location and instead suggests the magnet has come adrift in the cassette and " the only way to fix it is to call in a service engineer with small hands". I can't help feeling it might be a better, and considerably cheaper option, to try a couple of AA batteries first. :blink: