Have a look at the fuse clips. Is there good spring tension? Are the contacts clean and bright metal? Both legs of the clip solid and not broken? Might be worth using a sanding pen or a green scrubby to clean the fuse contacts and the fuse clip contacts. Gently bend the legs slightly closer together after cleaning to tighten them up.
When the fuse or clips get oxidized or corroded, or the spring tension weakens, or one of the legs of the clip breaks, the resistance of the connection generates heat. The heat weakens the spring tension of the clip making things worse. If your fuse holders look like they got hot (melted, yellowed), best long term fix is to replace them.
Changing to LEDs should also alleviate the problem as they draw less than 1/4 the power.
Winston-salem, NC
