I'd say your
ecu logged a fault (broken t piece) but couldn't identify the failure point (hence no cel) and went into safe mode (6psi).
Now the lines are fixed and the
ecu has been cleared, it's back to running it's normal values.....bet your happy!!
The restrictor pill is there to reduce boost spike and act as a fixed air bleed, the t-piece is just there as the tap in point for the boost control system to raise the boost above the 6 psi gate pressure (bleeds the pressure so the wastegate see's less than 6 psi whilst the turbo pumps upto the boost threshold).
I think that link is in reference to the US market 2.5's, the photo is off Nasioc (US site).
Rossco