I have a 2012 Ford F150 Lariat with the 3.5L turbo. I had the rear stud on the passenger’s side exhaust manifold break as so many others have. I replaced the exhaust manifold, gasket and mounting hardware. Seem to fix the problem. A few weeks later the driver’s side had the same problem. Same fix all is good. A month or so after fixing the passenger’s side I start hearing another leak. I check and all bolts are intact. A few weeks later and now the drivers side is having a similar leak. Question is what did I miss and what do I do to fix it? When I reinstalled the manifolds, I tried to tighten all hardware to spec. I feel Like I got it all tight enough but maybe not. Should I have new gaskets before I tear into it again or just try to re-tighten everything. Looks like I will have to pull the turbos either way.