In 1940, number 447's chimney required replacing due to wear and oxidisation.

In the real world, many innovations do not require replacing the entire or some part of the equipment.

The amount of capacity laid up was falling and much of the world fleet would require replacing in the mid-1990s.

Some of the things you can try are free or low cost, while others may require replacing some expensive components.

Depending on use, the pad may require replacing once a week.

The V6 engine had a timing belt that requires replacing every 60K miles.

I'm afraid that your watch's battery will require replacing rather soon as well.

Yet more development would require replacing the small ferry with a bridge over the 400-yard wide channel.

Fixing the problem may require replacing new equipment with more advanced components at a cost of up to $20 million more.

The boiler of the latter was found to be in poor condition and would require replacing for the engine to operate.