Sean, welcome.
1. Dunno.
2. Check the circuit breakers under the dash first. My recollection is that the blower is on the stbd side above the battery. Basically, there's a bulkhead panel separating the v-drive locker and the battery compartment. I don't recall if there is an L-bracket inside the battery compartment that secures the bottom of that bulkhead, but I think you've got to find the way to get that bulkhead out. Inside (actually in the seat-back area) is where I think/thought that blower is. At the top of the panel on the v-drive compartment side (aft side) there are a few capped screws securing the bulkhead to fiberglass. Take the top capped screws out and then see if you can slide the bottom of the bulkhead aft. If not, there's a bracket in there. Remove it and then slide the bottom of it aft until the top edge is freed from the fiberglass structure. If it's not in there, I'll be a little embarrased ;-(
3. My S22 has hours displayed on the Tachometer and in the Engine menu of the Message Center. They don't agree because when the dash computer is replaced, the Message Center engine hours are flushed. If you don't have the engine hours on your Tach, it sounds like you get to pick your hours. I've thought about installing an analog Hobbs meter back on the engine somewhere but have found it easier to just keep track of engine hours on the garage wall (relax, inside drywall special area reserved for Epic hours and fuel useage - really great I'll take some pics sometime :-)
FYI, the first summer I removed every piece of upholstery except the engine and trunk covers. Long story, no pics.