What's the best way to ask for source code from Epson?

Epson has a printer driver that is open source called [ESCPR](https://support.epson.net/linux/Printer/LSB_distribution_pages/en/escpr.php) . This driver only supports printers up to a certain year. Newer printers are not supported by this driver. They've since ditched that one and created another driver called [ESCPR2](https://support.epson.net/linux/Printer/LSB_distribution_pages/en/escpr2.php) but this only contains partial source code, some files are pre-compiled static libraries (.a). [Here is the direct driver download link to the ESCPR2 "source".](https://download3.ebz.epson.net/dsc/f/03/00/17/28/09/4e8dc40219d4b52e414b608de92552af4fd46eca/epson-inkjet-printer-escpr2-1.2.35-1.tar.gz) There's an AUTHORS file with the email: > Seiko Epson Corporation What's the best way to ask for the source code of their newer ESCPR2 driver?