Okay, tomorrow was work on 911 day anyways :-)
Check the voltage when car is on, it should be reading 13.5-13.8+/- volts, if no,t the alternator is not charging the battery.
AAA, that's good, so they did the print out diagnostic, right and suspected the alternator.
Make sure all connectors are clean and tight, especially ground/s. Recheck voltage while on, if no change then it is time to remove and have the alternator bench tested, DO NOT FORGET TO BRING YOUR PULLEY HALVES or they will not be able to test it properly, especially at a FLAPS. Some alternator shops may have if they work on VWs but most will not. Get two opinions, I found the same FLAPs a city apart had different results
Caveat, if a rebuild is in order, test it before you leave, you do not want to be re-doing the work again. Ask me how I know :-)