Unless you’re 9’ tall with a 4 foot reach, you’re not going to be able to lay eyes on the turbo inlet tubes very well. You can glimpse the turbo inlets at the rear of the front wheel well and if you’re stock, you can tell if they’re loose.
If you’re not stock and have clamped silicone boots on the turbo & tube, a leak is a distinct possibility. While you could see the turbo inlet, you won’t be able to see the clamp to the boot / tube unless you climb up over the engine.
If you have an intercooler, that can also leak.