Bought it used Worked very well until earlier this week. I was playing loud with a sansamp bass driver DI and it faulted. I checked the bias, one set had red and green, the other was just red. I've adjusted the bias and both of them go from red to red and green which according to the manual means that the tubes are not properly matched. I played immediately after I biased it and it faulted again. Both times after faulting I turned it off and back on and lowered the master volume and output volume of the pedal a touch. I was able to play for another couple of hours without any issue. I'm assuming whatever problem i have is not super critical but this is a little annoying and i definitely don't want this to happen at a show. I just got the bass DI pedal and i've played with it three times now, the last two it faulted. Do i need to bring this to a tech? New power tubes?