2011 ford f150 lariat 136,100 miles automatic

Hi Scotty!  I took in my truck to a local mechanic for a creaky suspension noise that you can only hear with the windows down, while stopping and going or turning while moving.  I saw them take it out the parking lot to test drive it, but with the windows up, and they couldn’t get it to make a noise they said.  So they inspected the vehicle and stated that it all looked structurally fine, and that while they may not have heard any noises but if I do, it’s more than likely just old squeaky but still good parts and they didn’t even charge a dime for their inspection, walked out with just the keys being exchanged.  Well when I drove it, the noise is there clear as day.  They’re correct in that the vehicle drives just fine, but the noise is super embarrassing!  Is there anything I can do myself to locate the noise and get it to stop since they said there’s no point in fixing anything?

Been a fan for years, thank you for your advice!