Ran across this today. I have seen it before, not quite as badly as this. Entire roof appears the same, 9 years old, fairly good ventilation, no leakage noted in attics. I believe its a fault of the shingle/manufacture, but no easy way of determining who produced them. Would you write it up as " granular finish of shingles show signs of age and cracking, normal life expactancy should not be anticipated." ? Thanks!