I called two separate Aegean agents today and tried to upgrade two different Go Light tickets to Flex. Both agents informed me that this was strictly not allowed as GL tickets have limited change capabilities.

Could you please share with me your secret to success? Is it speaking Greek or perhaps Hellenic charm? Whatever the case, it is very important that information posted on Flyertalk is accurate and up-to-date. Could someone else try to do such an upgrade and report on the results - it should be done with an actual existing booking!