sedan model: from the trunk pull out the carpet retaining screws/plugs to access the tail light assembly mounting screws. pull them out, pull the tail light assembly out. from here you can replace any needed bulb.
how to change front left turn signal bulb on a 2004 chevy express
The easiest way is to bring it to a chevy dealer, because the two were companion brands.
With a soldering iron?
pictures of how to change front signal bulbs on a 2004 grand prix pontiac
The turn signal module is combined with the hazard light module. You need to remove the dash trim to get to it. It is right behind the hazard light switch.
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It is combined with the hazard flasher module
if it is an LED unit you cant you have to change the assembly as a unit
It means some type of routine service is required, usually oil change.