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How did the Pep Boys check the battery? Did they do both a static voltage and loaded voltage test? Typically, 300amps or so is a good load for an MB battery. If it's pulling 9V or less, whoops, your battery is going south.
Remember that diesels are a bit tougher on their batteries than spark-ignition cars, as the high compression means a higher cranking load.
Even if it's not the battery right now, that battery is living on borrowed time and replacing it would not be wasted money. However, you should check the charging system. Any warning lamps? ABS light on?
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