[E Sully]

From a quick look, the Red fuse on the left looks a bit twisted.
Wires get hot when there is a poor connection, or excessive draw from a failed component. Contacts in relays can pit and corrode from age causing arcing and increased current draw. Corrosion from moisture, dissimilar metals reacting. Expansion and contraction of metals can cause loose terminations and poor conduction. There were quite a few electrical fires caused by this when aluminum wiring was allowed in homes, which is no longer done. Homes that have aluminum wiring needed to have the terminations redone by having a copper tail spliced to the aluminum with an anti oxidant compound, and then the copper was connected to the device. These cars are old and few people check the wiring connections. Occasional cleaning of contacts at terminations and connectors and the use of anti-oxidant on the terminals helps. Checking the screw terminations at the fuse block so they are snug, but not so tight they crush the wires.