Need Help with HO European Steam Loco Repair

My son has a model of a German WWII steam locomotive. We aquired the model on Ebay and we are not sure of the manufacturer (looks like it could be Roco or Piko). The locomotive fell from its display shelf and there is damage in the front, in particular it’s not abvious how to put the translucent plastic leading to the headlights back in place. I searched the internet but I’m unable to find an assembly diagram, even for a similar locomotive. What would you guys do?

Sunnymarek, Try posting a few photos of the locomotive and tender, including both topside and underneath. Maybe a member here will recognize it’s origin and be able to point you in the right direction.