REGULAR INTERIOR MAINTENANCE
Check that each door hangs properly (or as it did before) i.e. does not stick, or swing open or shut on its own. Check for any uncomfortable floor slopes by walking in each room. Check that are no new or changed cracks or separations at the walls, ceilings and floors.
Check for new or changed cracks or separations in the walls. Check that water does not pool near the foundation from sprinklers or rain.
Check that no leaks have developed near the foundation, such as a faucet drip or air conditioning drip lines.