np man , btw b4 u do take them apart have u noticed less flow from them?? if not it just means that waste was in the sump when it kicked back on , happens to me as well.
also it could be your return from your pump just had some gunk growing in it. This seems to happen with my returns. I have tried different colors and types of return pipe and it always seems to happen. Your best bet is to clean them every 6 months or so along with your pumps. I use a pull wire with a pipe scrubber on the end and pull it through untill it is clean.