Let me guess, first time flight physical EKG at 35, right?

I also have a right bundle brach block. I was pretty stunned when my AME told me, but then he signed off on it, and that was that....

Personally, I wasn't satisfied - career and all - and sought some more-expert opinion.

My dad was friends with one of the worlds foremost cardiologists in Houston, who has since passed away. 3D ultrasound of the heart etc., I can't even remember all the stuff really.
After all was said and done, he sat me down in his boardroom and told me to not worry about it...
This guy had signed autographs from just about anybody famous that needed heart help on the wall, so I figured that's good enough.

I still had doubts about what it all meant, but learned to let it go...

My advice to anybody in this field:
Get an EKG before you do your FAA mandated one at 35.
If there is any anomaly, document everything.
Get a second opinion. One AME might sign it off just like that, another might require all sorts of documentation...

I was prepared for my Delta physical and had a whole folder of stuff with me. They looked at the EKG and said it looked better than the one I brought so that was that...

YMMV
PM if you need any extra info...

Cheers
George