Fault code B0073 Second row left seatbelt pretensioner

[TeamG]

SRS warning light came on today. Checked the code and as per the title. Cleared the code, drove for 1/2 mile and it came on again. Cleared it, came back on immediately. Wiggled a few wires under the seats and gave the area around the seatbelt some percussive maintenance. Fault cleared and has stayed cleared for an hour of driving with a few stops.

This appears to me to be an intermittent connection issue rather than a permanent fault. Where is the seatbelt pretensioner mounted exactly and what/how do I remove bits to get to it?

Intention is to disconnect battery, then disconnect the electrical connector and give a bit of a clean with contact cleaner.