Every day we see equipment damage that results from what started as a minor issue that could have been resolved somewhat inexpensively if caught early, but turns into additional repair time and material when allowed to go un-attended.
A very common example is a tiny drip in your pool equipment that is allowed to continue, since it seems so minor. But a drip, no matter how tiny, is an opening to the atmosphere in a system that is supposed to be closed.
This can lead to the pump losing prime which can lead to really big problems.
Motors that are making an unusual noise, can sometimes be the result of a ball bearing that has failed. Many times, we can replace motor bearings and give that motor additional years of service.
Don't allow little problems to go un-checked!