The following is taken from my Haynes Repair Manual for the 2003-2009 T4R:
The parking light bulb sockets are located in the outer, upper corner of the headlight housings.
These bulbs are difficult to access with the headlight housing installed, but they are accessible.
To remove the bulb socket from the headlight housing, turn it counterclockwise and pull it out.
It is not necesary to disconnect the electrical connector unless you are removing the headlight housing assembly.
To detach a bulb from the socket, pull it straight out.