Hello all, I bought a DT25 roughly 1 and 1/2 years ago and am really loving it, just got my hands on a POD HD500x and the interaction is great! Unfortunatly i think the valves need replacing as it has been humming and popping a whole bunch. How would i go about replacing them? I know a bit about it but would like a step by step to reffer to and any other advice would be great! Please don't tell me to goto a tech as i like to be able to do this kind of thing myself, just like changing strings.