What's the likely fix for this old shower leak

[WaterTight]

Leaking from roughly/somewhere where the red arrow is pointing. Is it a case of unscrew all the threaded connector piece and change washers / o-rings if you can find right sizes or is it likely a right-off you'll risk making worse?

 

[rocketmanbkk]

Did you fix it? If so, how?

I did one and changed washers and put some lsx on it!!!!

Hasn't dripped since, 6 weeks now and counting.

It's like being a recovering drunk, waiting for the call or waiting to see if I'll drink again. I'm on tenterhooks!!!!