Virtuemart/Joomla USPS Shipping Module malfunction fix

Our website has been running quite well with Joomla/Virtuemart for the past years - but recently the USPS shipping calculator seems to be malfunctioning. At checkout, rather than showing the various shipping options that were there before, there are only the "pickup locally" options that were custom added when the site was set up. Because the site was set up by someone other than myself (I'm just a single mom, visual artist, housewifey thing - yeah, clueless fits for this project), I would need someone who can go in and get this working again. My hunch is that the module needs updating, but I wouldn't even know where to begin looking how to do that... The faster, the better - it seems like orders have completely stopped coming in since then...which causes problems on the homefront... Any help for it? And obviously, the lower the price, the better - bartering for some of my artwork would be even better...