Fixing Miele W1613 intermittent drain fault and code F51 due to blocked pressure sensor chamber

This is an explanation of the problem and solution to solve a problem with a misfiring pressure sensor on a Miele W1613 washing machine. I broadly followed the steps outlined in this article, but it was difficult to visualise without pictures: https://www.fixya.com/support/r25205894-mi... I thought I'd take this guide a step further and capture some of it on video, identifying the various components, and the fix.