From your example (land 3/land2) it seems you refer to Boeing ship.
On the Bus between 1000 ft anf 200 ft RA any change of landing capability requires a GA, for the reasons explained by 737incognito.
If the downgrading occurs between OM and 1000 ft you can convert your approach minima to 50ft/200mt (or whatelse catIIIa) and "go and see".
HVIII