I sadly do not have another psu to test it with.The first rule of trouble-shooting a HeNe is always suspect the power supply first. Do you have another supply to try? Ballast resistors cook sometimes, which can cause the behavior you are describing.
iirc it's an 1103pI would suspect the driver/supply over the tube as well. Which tube does it use? If you would like. I could troubleshoot it for you free of charge if you pay for shipping. Send me a PM if you are interested.