Tony Duell wrote:
  This is actually another problem with those lists
of stock faults. If a
 fault is caused by an under-rated componet, it's likely that, after a
 couple of years, all have failed and been replaced (hopefully with a
 better-rated version). And therefore if the same symptoms occur in the
 future, the cause could well be soemthing totally different. 
 Yes, the *next* under-rated component in line ;-)