We extend the formalism of Leibovich, Ligeti, Stewart and Wise in the $1/m_Q$ expansion of Heavy Quark Effective Theory for the $\overline{B}$ semileptonic decays into excited $D(\frac{3}{2}{}^{+})$ mesons to the opposite parity states $D(\frac{3}{2}{}^{-})$. For $D(\frac{3}{2}{}^{+})$ the $1/m_Q$ current perturbation dominates over the leading term at zero recoil, while for $D(\frac{3}{2}{}^{-})$ the $1/m_Q$ perturbation due to ${\mathcal{L}}_{\mathrm{mag}}$ dominates also at zero recoil. We show that the corresponding $1/m_Q$ magnetic coupling is proportional to the mixing between the states $D(\frac{3}{2}{}^{-},1^{-})$ and $D(\frac{1}{2}{}^{-},1^{-})$ induced by the tensor force. We point out some subtleties that appear in this respect in HQET.

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