Thanks for all your input. The consensus appears to be there’s something wrong around the valley area. I will probably need to hire somebody to go up there and actually look. Also, there is no sign of leak inside the house (not yet, anyway).
Now, this is probably a stupid question but I will ask it anyway. How can I protect myself from some contractor that will say “you need this, you need that and it will cost you thousands” when in reality all I really need is a simple fix costing hundreds? It is hard to argue with an “expert”. I’ve already ask friends around for a “trusted” roofer but no luck.
One more question: do you usually pay for “please come and look and give me an estimate” service?
BTW: I live in Northern California.