Just checked my tires tonight. Back driver side was 15 PSI, all others were 32 PSI. It hasn't been more than a month or so since I last checked these, but this one could have been that low for a couple of weeks. Going to get it patched tomorrow, but do you think any damage was done? It's a newish Goodyear Assurance with plenty of tread left. I've put maybe 500-750 miles on since last checking the pressure. Thoughts?