Swapped the relay last night. Took about 10 minutes.

1) Remove coin holder / ashtray.

2) Use flathead screwdriver to free zip-tie on wires.

3) Use 10mm ratchet-wrench to undo bracket on relay.

4) Pull relay out through the coin-holder space and swap.

5) Replace and remount relay.

Done.

Car seems to be working better now. I cranked it up here and there over about a 30 minute span. Time will tell.