I've tried various SMD codebooks but the marking is so vague. The components I'm looking for is the 6-pin (SOT-363?) components with code "12" and vertical "L". I guess that all those vertically positioned markings (46, L, B6) are irrelevant (another board I have has this component with vertical "N" and not "L") thus the code would just be "12". Perhaps those two dots will be of any help to narrow down the possibilities -- do they indicate two ground pins by any chance?
I've found that one of the possible components could be MUN5312DW1T1, but those two dots keep me from pinpointing it as this components usually (always?) has one dot.