I've got a strange problem on my CFTBL. 4 lamps on the same circuit (P-A-I-D) are not working when the pinball is turned on. The test "All Lamps" doesn't turn them on. Then suddenly, when the machine has been on for a while (approx 30min), all lamps are working. Then when I turn it off and on within the minute everything works. But, when it's off for a while, I get the same non-working behaviour. The soldering on the circuit seem fine as I can see. Anyone had this experience or any ideas how to do some troubleshooting? "Feels" like something with the heat generated does some magic?