Does anyone know what the current requirements are at the 5 year interval after a CF tank has gone through digital wave corps MAE test and been re-certified? I have a neighbor that bought a used cylinder that was re-certified in 2017 which means he will have to do something next year to continue getting it filled at the dive shop. I read a previous post that said the cylinder would have to go back to digital wave for another MAE test, is this true? If so what is the cost (not including shipping)? If the MAE test is required, is there anyone on the east coast side that does it now? I'm thinking someone out there has encountered this already. Thanks for any info.