I had some nagging pain in my right shoulder for a couple of weeks now.
Looking back in my training logs, it all started when I thought I'ld try a change, and decided on a wide grip on the incline bench press.
Went to the docter, he manipulated my arm for a while. I felt it most when I rotated my arm in front of my chest inward, with the doctor giving resistance, or when moving the arm behind my back.
His conclusion: damage to the supraspinatus. And he told me to get an echo. Echo's aren't THAT expensive, and they don't give as detailed information as an MRI. And the shoulder IS a difficult area to Echo. But I got lucky. The specialist noticed a slight thickening of the bursa, and a pattern on the tendon of the supraspinatus.
I'm expecting a full report in a couple of days.
I'm not saying that's what your friend has, but the doctor told me it was a very common problem and nodded when I "confessed" on working out in the gym.