That’s why it wasn’t in the book.
In my years after, I found instances of conflicting or missing factory information, misprints, updates to materials I had, and out-and-out errors.
That’s normal. It’s not routine, but it’s not out of the realm of possibility by a long shot. And that’s where a mechanic needs to stop and think. Trust, but verify, as they say. Feel free to laugh at my lack of knowledge, and feel free to share your own story; we all have them. This is the way things go sometimes. The OEs might leave you high and dry every now and then (not often, thankfully), but when it happens, you’re not alone. We’ve all been there before, and even the oldtimers are stuck right there with you every now and then.
Stay cool and don’t be afraid to go digging to get the knowledge you need. And be nice to a curmudgeonly veteran tech in a nearby bay—it pays off sometimes.