hey all,
i just wanted to give an update on my status. i went to my local auto shop and they took care of the P1780 error.
as mike suggested, my mechanic checked inside the loom in the trunk and found majority of the wires connecting to the brake, reverse, and taillights frayed. it was due to the normal wear and tear as expected.
we patched it up, resetted the check engine light and everything was back to normal. the reverse light on dash stopped appearing, rear lights indicator disappeared, and engine stopped shuddering before coming to a full stop.
here are some photos from the repair:
thanks again to everyone for contributing. i just saved ~$500 worth of repairs.
(=
-dcskyline