It depends on what's making the leaves brown, Macca. If it's the frost, only time will tell. You could give it a light feeding to encourage it to repair itself faster, but you really won't know until you see sprouts lower on the stem.

If it's root rot from poor drainage or too much water, by the time the leaves start turning brown, it's too late to do anything. Just keep it in mind when you replace it, when choosing pot and compost, and thinking of the watering schedule.