We still can't see whether the MJE 350's are oriented properly. A photo showing the faces of the MJE350's would suffice.
What are your voltages at T1 and T5?
You can measure the R1 resistors when they are in the board (amp off).
Passed all voltages with excellence. Testing the headphone jack now. Do you recommend I do the headphone jack grounding mod that is sticked right now as well? Is it mandatory?
Since you asked. T1 and T5 are both around 80
The photos I take of the MJE-350 don't show much, but the text is away from the volume knob if that helps. It all looks good to me.
EDIT: Headphone TRS jack jumped to 13 then went to 0. It's not 9, but I think the speedball is supposed to raise that voltage. It's safe to test, correct?