Spath @14.00
You need to trigger the re-calibration procedure then drive for 15 minutes or so and it will sort itself out.
If you say what vehicle it is (as has been said a dozen times), someone can probably find the re-calibration procedure and tell you (or you can do it yourself).
Look for TPMS recalibration [vehicle model and year] or reset TPMS [vehicle model and year], or something similar.
Or, as you suggest, look in the owners' handbook
Good luck.