The Epson service box, also known as a maintenance box, collects excess ink during cleaning cycles and from borderless printing to prevent smudging. Once it's full, the printer will stop functioning until it's replaced. Replacing the service box is part of routine printer maintenance to ensure proper operation and avoid ink overflow​( https://www.linkedin.com/pulse/how-do-i-get-epson-support-phone-number-raysha-savvy-je1te