I had a similar error a couple of months ago. This is what Tesla wrote on the diagnostics form after performing repairs:
Concern: Customer States : alerts appeared seat belt safety restraint system fault, customer states
he does not feel the vehicle would be safe to drive
IVR Context -
Customer facing message 'Front left safety restraint system fault'
Removed and replaced Vehicle Controller Left. Re-installed firmware and re-calibrated vehicle LH
side glass and front left seat.
Correction: Module - Body Controller - LH (Remove & Replace)
Parts Replaced or Added
Part Quantity
ASY, MY, LV PREM
CONTROLLER,
LH(1497847-02-D)
1.00
Correction: General Diagnosis
Correction: Perform Validation Test Drive