A recent house inspection carried out by Qld Home Buyers Inspection Service, resulted in the followingThe following are some examples of stumps with packing fitted to their tops, due to stump movement. 
Packing is usually fitted due to stump movement (that has occurred since the house was originally constructed) or incorrect fitting of the stumps. The latter is very unlikely with a house built in the particular era. Neither are good.
If the stumps were incorrectly installed (when constructed). This would indicate very poor building practice from the outset. If they were packed after the house was built (due to movement) further movement is likely and replacing them, can be costly.
Stump movement

The chances of further stump movement occurring are far greater than it not occurring.

The only way to guarantee against further movement, is to replace all the stumps with new ones, at the same time.  
If only replacing some stumps, the others are likely to cause major problems (and expense). When further movement occurs.

Considering the high probability of further stump movement occurring. Also that no alterations, renovations, extensions (including painting) can carried out. As it will affect any improvements.

The choice of materials when replacing stumps is very important and maybe dependent on the type of soil.
Concrete stumps can deteriorate and fracture, due to the high salt content in some soils. Timber stumps may have to be used, as an alternative.
Steel columns may also considered, but they are prone to rusting. Longer columns can flex and cause the house to move in differing weather conditions. This would need bracing to be fitted between them. It is always preferable to have columns supported by concrete footings, with plates fitted to their bases. Rather than having the columns penetrate the concrete. Which can lead to rusting of the columns, fracturing of the concrete and is more expensive to replace.
Stump movement


Qld Home Buyers Inspection Service, for your Building Inspections Brisbane, all suburbs