GPS hardware fix

Hi Members,

I'm searching for some info which can help me fix/repair my GPS functionality.

Cause: My S6 got little bit flooded. I brought it to service point in order to clean and dry it out. For sure there was SUB board replaced.

Problem: GPS is not working at all. Any application that require this functionality simply fails on GPS fix.
When an application starts, the little GPS bar icon blinks for 3 times and than just disappears.

Questions: Where is the GPS module/antenna located?
Is there a possibility to replace that module/antenna?
Or maybe it is integrated to motherboard or something?
Maybe service did some mistake like did not connect a wire or something...

Add on: All other radios are working correctly.
Firmware has been flashed (x2)


Any help will be appreciated.