Scion tC engine tapping or knocking noise

Update: There is apparently a TSB by Toyota in Aug 2011 about a defective piston assembly which causes excessive oil consumption for 07-09 tC's and affected xB2 with the same 2AZ-FE engine as us. 55k Miles on this 2008 Scion tC. Regular oil change intervals and never let the oil go low. Never had any issues before but on this last interval I noticed this unnerving tapping or knocking noise which seems to be coming from the upper end of the engine.

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