A bit more info after some troubleshooting. The sound appears only when hx is on, it is the SDA00 valve connecting the two boilers. Regardless, there is not enough pressure coming out the group head whether HX is on or off. Any help would be much appreciated.
Original posting:
I had the machine since 2017. Just replaced one of solid state relays for the steam boiler. Since then the espresso pump has been making noises. See this video; https://photos.app.goo.gl/tAWtQAB8HhkDVQcPA
I descaled the pump and boiler. The noises persist. Do I need to replace the pump or this something simpler?
Thank you!