Check these vacuum lines out too. You need to pull the intake cabin air filter housing and the shroud around the brake system to gain access to those behind the intake manifold. It is tight but doable. Use an inspection mirror to inspect them. #5 electric switch is tucked under and snapped onto the intake. #6 is a check valve...make sure you re-install the correct direction. It is color coded, black and white side.
There is also another 12" piece of tubing that is connected right next to the #9 cap that runs down to a cannister that is not shown in this photo.
Any or all of these 3.5MM inside diameter (.127" so 1/8th will work too) vacuum lines will cause a lean code if cracked...and usually something that points to secondary air pump.
All the sponsors of this forum carry the 3.5MM vacuum tubing but it is a little pricey compared to what you find on e-bay when you search for it.