Right Little finger numbness + grip weakness

Hi,
I have a patient who is 38yrs old. He is about 5,7" and very muscular. I have seen him twice now. First time he had lots of trigger points in his upper back for which i treated and he reported an improvement a few days later. His problem has been ongoing for around 3 months now. I suspected possible Thoracic outlet syndrome, possibly Csp disc prolapse.
Recently I treated him with maitland mobs due to his hypomobile spine.

HPC: Considerable weakness and sensation changes in right little finger. Had pain in right upper back and changes in sensation at back of arm.

PMH: L3 and L5 prolapsed discs within last year.

No red flags.
Upper limb tension tests - Positive, into fingers and forearm, very uncomfortable for patient
Posture - good
Neck - NAD
Thoracic Sp - NAD
Palpation - C and T spine hypomobile

Anyone have any ideas, I'm not sure what to do next with this patient what can I look at? Do you have any ideas what treatments I should do? I'd really appreciate some help as I'm at a bit of a loss.

Thanks alot
Kane