Remove the headlight assembly and reinsert, but ensure the housing tab fits into the adjuster mechanism properly. It's not hard, but a careless mechanic may not even bother to check as he unknowingly slaps the headlight back in. While you are there (inside joke) make sure the headlight housing is, in fact, engaging ITS tabs at the bottom.
As for the dash going out, if the techie was behind the headlight, he may have knocked the connectors loose. So, again, when you remove the headlight and "while you are in there" , double check all connectors are secure.