How to fix these build errors?

There are no errors in editor or the game view and the build itself plays fine. When I create a development build I notice these errors and, not for lack of trying, I cannot seem to figure out what they are or how to fix them.

I feel like it's related to this:
https://www.reddit.com/r/Unity3D/comments/5jkymu/a_script_behaviour_has_a_different_serialization/
https://github.com/Unity-Technologies/AssetBundles-Browser/issues/32

but I have no idea what I "#ifdef 'ed" or where in the thousands of scripts the offending culprit would be. Any hints for this Unity noob would be appreciated. Thank you

 

There are many shader warnings I don't like too, but this error occurs many times:

(Filename: C:\buildslave\unity\build\Runtime/Serialize/SerializedFile.cpp Line: 2001)
The referenced script on this Behaviour (Game Object '<null>') is missing!
(Filename: C:\buildslave\unity\build\Runtime/Mono/ManagedMonoBehaviourRef.cpp Line: 294)
A scripted object (script unknown or not yet loaded) has a different serialization layout when loading. (Read 44 bytes but expected 184 bytes)
Did you #ifdef UNITY_EDITOR a section of your serialized properties in any of your scripts?

Between my own scripts and the asset store stuff, there are many instances of "#if UNITY_EDITOR", how can I isolate which ones need restructured?