Slow water leak in high pressure system

Hi,

We have had our machine for a few years, it hasn’t seen much use. From new we have had a leak that I couldn’t identify, but today watching from the start of the job I narrowed it down to around this component in the photo. I think this is part of the high pressure system?

Is there any documentation on this part leaking, or instructions on checking seals etc?

We had the same leak, but unfortunately, we didn’t document the procedure for fixing it. We have a maintenance guy that works on our Haas CNC machines, so I just asked him to fix it for us. I believe the part had just come loose.