Adjusting ability scores of summoner's Eidolons

[Yeebin]

I can't find it anywhere but am I to assume that the base ability scores of Eidolons are not adjustable at creation?

Meaning the default Biped is Str 16, Dex 12, Con 13, Int 7, Wis 10, Cha 11 and can not be adjusted to Str 16, Dex 12, Con 11, Int 10, Wis 10, Cha 10 for example.

There is no clear rules in the APG on this and no one at least in a google search has ever asked the question.

[Ilja]

No they are not adjustable. The rules are clear: This is the stats an eidolon has.

[Brf]

The base form determines its starting ability scores, as it says in the first sentence of the Base Forms section.