Let $K$ be a local field of characteristic zero, $k$ its residue field, $R$ its ring of integers and $p$ the characteristic of the residue field $k$. Let $G$ be the Galois group of $K$, $I\subset G$ the inertia group and $P$ the maximal pro-$p$ subgroup of $I$. Let $I_t:=I/P$.
Let $A_0$ be an abelian scheme over $R$ with generic fibre $A$. Then $A[p]$ is an $I$-module. Let $V$ be a Jordan-Hölder quotient of the $I$-module $A[p]$. I am interested in the representation $I\to Aut(V)$.
Question (*): Is it true that $P$ acts trivially on $V$?
(I have seen that there are results of Raynaud and Serre on the "action of $I_t$ on $V$". I want to study these things, but I am already stuck with Question (*) at the moment, i.e. with the question whether $I_t$ acts at all.)
Maybe someone can help?