Spring perches are a common failure in the UK. Repair is effected by a riveted on repair panel gotten from the Stealer price of which is under $50 per side (iirc). How can it cost $2000 - $3000 to fix in the US?

Glowplugs are best attacked with the engine hot. Another fail point is injector seal blow-by which needs a re-seating tool to cut a fresh seat in the head.