Matrix t2*K(2) in Subspace 93 with Dimension 8

(K(2) is the second-order Grosse operator)

(-27*t*U)/4 ((3*I)/8)*(3*I + Sqrt[3])*t*U 0 (-I/4)*Sqrt[3]*U^2 ((-3*I)/4)*U^2 ((3*I)/4)*t*U (9*(-I + Sqrt[3])*t*U)/8 0
((-3*I)/8)*(-3*I + Sqrt[3])*t*U (-27*t*U)/4 (-24*t^2 + (3 - I*Sqrt[3])*U^2)/8 0 (3*I - Sqrt[3])*t^2 -((-3*I + Sqrt[3])*t*U)/8 (-3*Sqrt[3]*t*U)/4 (-8*Sqrt[3]*t^2 + (3*I + Sqrt[3])*U^2)/8
0 (-24*t^2 + (3 + I*Sqrt[3])*U^2)/8 (-21*t*U)/4 (3*t*U)/4 (3*Sqrt[3]*t*U)/4 (3*I - Sqrt[3])*t^2 (8*Sqrt[3]*t^2 + (-3*I + Sqrt[3])*U^2)/8 ((3*I - 4*Sqrt[3])*t*U)/4
(I/4)*Sqrt[3]*U^2 0 (3*t*U)/4 (-15*t*U)/4 (-5*Sqrt[3]*t*U)/4 -(Sqrt[3]*U^2)/4 0 ((3*I - 2*Sqrt[3])*t*U)/4
((3*I)/4)*U^2 (-3*I - Sqrt[3])*t^2 (3*Sqrt[3]*t*U)/4 (-5*Sqrt[3]*t*U)/4 (-17*t*U)/4 t^2*(-4 + U^2/(4*t^2)) (1 + I*Sqrt[3])*t^2 ((3*I)/4)*(2*I + Sqrt[3])*t*U
((-3*I)/4)*t*U -((3*I + Sqrt[3])*t*U)/8 (-3*I - Sqrt[3])*t^2 -(Sqrt[3]*U^2)/4 t^2*(-4 + U^2/(4*t^2)) (-11*t*U)/4 (3*t*(U + I*Sqrt[3]*U))/8 (-1 - I*Sqrt[3])*t^2
(9*(I + Sqrt[3])*t*U)/8 (-3*Sqrt[3]*t*U)/4 (8*Sqrt[3]*t^2 + (3*I + Sqrt[3])*U^2)/8 0 (1 - I*Sqrt[3])*t^2 (3*t*(U - I*Sqrt[3]*U))/8 (-13*t*U)/4 (8*t^2 + U^2 - (3*I)*Sqrt[3]*U^2)/8
0 (-8*Sqrt[3]*t^2 + (-3*I + Sqrt[3])*U^2)/8 -((3*I + 4*Sqrt[3])*t*U)/4 -((3*I + 2*Sqrt[3])*t*U)/4 ((-3*I)/4)*(-2*I + Sqrt[3])*t*U (-1 + I*Sqrt[3])*t^2 (8*t^2 + U^2 + (3*I)*Sqrt[3]*U^2)/8 (-13*t*U)/4