There is a maximal nontoral (not contained in a conjugate of a fixed maximal torus) elementary abelian $2$-subgroup of rank 6 in $G = PGL(8,7)$. I denote this group by $A$. Its normaliser $N_{G}(A)$ is $A.N$ where $N$ is a maximal subgroup of $Sp(6,2)$ of order $40320$. And this $A.N$ is itself a subgroup of a Class 8 maximal subgroup of $G$ and is isomorphic to $SO_{8}^{+}(7).2$, I believe. I've been trying to construct this $A$ in $G$ for two days. The following is what I did but didn't work.
> d:=ClassicalMaximals("L",8,7:general:=true,classes:={8});
> X:=GL(8,7);
> G:=PGL(8,7);
> ro:=hom<X->G|G.1,G.2>;
> m3:=ro(d[3]);m1:=ro(d[1]);
> SUBOFM3:=Subgroups(m3:OrderEqual:=2580480);
>> SUBOFM3:=Subgroups(m3:OrderEqual:=2580480);
^
Runtime error in 'Subgroups': Cannot compute subgroups of all composition
factors of this group.
I intended to get this $A.N$ and then use the command of pCore to find A. I suppose I need to narrow down the searching range a bit... If I get the Sylow $2$-sub of $m3$ and then try to find elementary abelian subgroups of order $2^6$, it'd be killed by Magma. Any suggestions would be greatly appreciated!