In a city where 24-hour dining spots are few and far between, there's much panic whenever one of city's 5AM diners goes dark, even if for only a weekend or two. Such is the case with Pinecrest Diner on the corner of Mason and Geary, which is currently papered over and out of commission over the weekend. The historic diner with a sordid past is dark, but sources at the restaurant say that it's only a quick remodel and that they're hoping to be back up and running in a week or so. So, no need to sound the alarms ... at least not yet. Stay tuned, yes?