Help needed to reset back to Stock

Hi
I am running Xperia Z5 (E6653) unlocked bootloader, Stock MM (32.1.A.1.185), modified stock kernel (only added SuperSU, TWRP, DRM Fix).
Is there any way I can go back to stock Lolipop (stock MM will also work).
Edit: What steps do I need to restore TA partition and relock the bootloader?

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