I have a 2008 Pipepro 304. I was having trouble adjusting the VA adjust to get to the right volts and amps when it was set on stick welding. I replaced the control board because the knobs were rusted and would not adjust because the machine has set on the back of my rig since I have had it. Now that I have replaced the control board, I am not able to adjust the VA adjust to the right volts and amps when it it set on spool or stick. What else could be causing my problem?