One Channel Down in Preamp Help

Hello All....exhausting Hifi month , first my cartridge cantilever dislodges , my Phono Stage goes down & now my Manley Jumbo Shrimp preamp has some kinda short on left channel...

It happens all all inputs into Preamp so its gotta be the pre...I swapped all tubes...same result...I can actually slightly move the circuit board in middle (pointing up)  & it cuts in & out...

Cold solder joint or failing part...? Any tips before I spend a month waiting on tech support :) Thanks!