The engine knock/thump I had in my 09 V6 was resolved by replacing the right hand cylinder head and re torquing the left hand exhaust cam. I did have to go back a second time to replace the front crank seal that started leaking after the TSB was done.
This was covered by TSB 09-15-1 3.0L INTERMITTENT CYLINDER HEAD CAMSHAFT KNOCK/THUMP NOISE
This was covered by TSB 09-15-1 3.0L INTERMITTENT CYLINDER HEAD CAMSHAFT KNOCK/THUMP NOISE