A small air leak will not show up on any diagnostics. The only air mass/volume sensor is the maf. The possible tube split is post maf so it won't show up, especially as the alfa diagnostics is very crude (compared to say Vag Com)
The air pipe clips can be done and undone with any fine nosed, wide spaced pliers. I find a standard plumbers compression joint type pliers fine once you have the knack.
Get in your engine bay and have a good look.
Remember there is more collective knowledge on this forum than ANY dealer.
