if you've removed the latch and considering replacing it, one last test may be of interest.
connect the electrical connection and wiggle the harness.
i has somewhat similar problem. my lock light would light on and off while driving. in the process of disconnecting the harness from the latch, the LED on the lock switch started to flash.
I took the latch assembly apart and found a cold solder on the printed wiring board where the mating connector (to the harness) was soldered. re-flow the solder and my problem was solved.
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