I have a similar issue with the same model. The headphone jack is very dodgy. I have to insert the headphone plug (no remote) just right to get any sound, but even then it’s an unreliable connection.
Could yours be similar?
I followed the Service Manual to open mine up and resolder the headphone part of the connector. This maybe helped a bit but it’s still not good. I couldn’t find a replacement part (combined 3.5mm plus remote) anywhere (or my google-foo deserted me).
Kevin