I have had a low voltage outdoor light setup running for years. All good. Something happened the other day that tripped the circuit. When I reset the circuit and the lights go on I start to smell electrical burning and the wire cable feels hot to the touch. Then the circuit breaks. I assume I have a short somewhere. I have about 10 lights on this transformer. How do I find the problem? Cables are all buried. Trying to fix it without to much digging. Any ideas?