1" low is the perfect time to catch this. Most folks wait until they hear grinding and crunching. At least 2x a year go under and check all fluid levels. And before any big trip. At least every month check everything under the hood. Check the air in your tires at the same time. As we tend to run lower psi the tires tend to look a bit soft and you can forget that 28 psi looks very much like 18 psi. The lower the pressure the faster the tire can heat up and start to break down. Especially in the sidewall where all the flex is happening. Good job on the early catch on your transfer!