I'm booked CLE-NRT-CLE on a complicated ticket on CO. I need to get to CLE from MEM.

1. Can I book an award ticket MEM-CLE-MEM on CO without creating problems for myself? (Going to CLE a day before the CLE-NRT start.) From what I read, it seems to be legitimate routing, but I'd like to make sure. I get confused on nested, end-on-end, etc bookings.

2. I didn't look at the fare rules when I booked it and now I can't find a way to get to them. There is one segment that is an S; the rest are Ls. How can I access the fare rules? (I've looked both at the reservation and the receipt and see only a note on Fare rules, but it doesn't have the complete fare rules or a link that I can see.)

3. I would like to book CLE-MEM on the same day I get to CLE from NRT. If the flight is late, what are the consequences? (Or how easy is it to change an award ticket?)

Thanks. Y'all are really helpful.