Saeco Intelia HD8759 hissing noise and water leaking

Hi everyone

Im trying to figute whats wrong with my coffee machine so that I can attempt to fix it myself.

This machine is 5 years old all the regular maintenance has been done as per Saeco.

Lately I noticed some clear water on the right side of the machine under it seems to be accumulating inside on the right edge where the brew group is. I circled it in the picture. Couple months ago it started making this hissing noise, it seems to be coming from that water inlet, please see video. Any suggestions where this hissing sound is coming from. Everything on the machine works as it should.

I cleaned the brew group twice in the last couple of days greased, filter screen on the brew group cleaned as well. I didnt change o-rings yet until I figure out what parts I need so that I can order everything together.

Thank you