Trade Required: Underfloor Heating

Description: I have a skirting board heating system. I have a leak which is starting to damage floor. We shut down heat whicch reduced leaking but no heat in our kitchen now. The system works as follows.
At this site: https://www.discreteheat.com/videos.aspx
Video called:
Feed Sets - Manual TRV & Remote Control
From:
2 min 40 sec.
Just need a small flat head screwdriver to open it. But once open i wouldn't know what to do. Would be very grateful if someone could help me out

Location: Sandyford, Dublin

Budget: €30 - €400 (Quotes may vary based on the job)

Job Id: 315056