LOW PARTS SALES (20 REPLACEMENT DUCTS SOLD TO DEALERS DURING 5 YEARS TO FIT 12,484 1984-1987 MODELS) ARE INDICATIVE OF A LACK OF A PROBLEM, SINCE SOME (OR ALL) PARTS WERE PROBABLY REPLACED FOR REASONS UNRELATED TO THIS PE, E.G. TO REPLACE PARTS DAMAGED DURING SERVICING OR IN COLLISIONS.===