several old easYgen-3500 (1A or 5A,) variants can be replaced with easYgen-3500XT-P1 or P2
Please consider the documents here for more information:
https://wss.woodward.com/manuals/Legacy/Forms/AllItems.aspx?RootFolder=%2Fmanuals%2FLegacy%2FeasYgen%2D3x00&FolderCTID=0x012000CD3361828B80584BB15C4E3F5A49FDA5&View=%7B424B9C1D%2D2CC3%2D4A50%2DA68E%2DB15FB0B602FA%7D