Identify E2 component on PCB
Boy, comparing E6 to E12 it looks darker than the other (1206/1210) MLCC caps so it could be a ferrite discrete device. Try measuring E6 on Ωs scale to see if you get a reasonable value (10s or 100s of Ωs) consistent with a ferrite instead of a cap.

This (my) assumption is based on that the E2 and E6 circuits look to be similar.