Many operators can fix a single line themselves once they can see it — which is exactly what the free diagnostics are for. A consultancy earns its fee when the problem is structural: several leaking lines at once, a team that has normalised the losses, or a group that has outgrown the founder’s ability to watch everything personally. Run the numbers first, then decide.
From Restaurant Consultancy in Dubai — the full reading, with the method behind this answer.