    /// @dev liquidation internal logic
    function _liquidateInternal(uint _posId, address _poolToRepay, uint _repayShares)
        internal
        returns (LiquidateLocalVars memory vars)
    {
        vars.config = IConfig(config);
        vars.mode = _getPosMode(_posId);

        // check position must be unhealthy
        vars.health_e18 = getPosHealthCurrent_e18(_posId);
        _require(vars.health_e18 < ONE_E18, Errors.POSITION_HEALTHY);

>>>     (vars.repayToken, vars.repayAmt) = _repay(vars.config, vars.mode, _posId, _poolToRepay, _repayShares);
    }
    function _repay(IConfig _config, uint16 _mode, uint _posId, address _pool, uint _shares)
        internal
        returns (address tokenToRepay, uint amt)
    {
        // check status
>>>     _require(_config.getPoolConfig(_pool).canRepay && _config.getModeStatus(_mode).canRepay, Errors.REPAY_PAUSED);
        // get position debt share
        uint positionDebtShares = IPosManager(POS_MANAGER).getPosDebtShares(_posId, _pool);
        uint sharesToRepay = _shares < positionDebtShares ? _shares : positionDebtShares;
        // get amtToRepay (accrue interest)
        uint amtToRepay = ILendingPool(_pool).debtShareToAmtCurrent(sharesToRepay);
        // take token from msg.sender to pool
        tokenToRepay = ILendingPool(_pool).underlyingToken();
        IERC20(tokenToRepay).safeTransferFrom(msg.sender, _pool, amtToRepay);
        // update debt on the position
        IPosManager(POS_MANAGER).updatePosDebtShares(_posId, _pool, -sharesToRepay.toInt256());
        // call repay on the pool
        amt = ILendingPool(_pool).repay(sharesToRepay);
        // update debt on mode
        IRiskManager(riskManager).updateModeDebtShares(_mode, _pool, -sharesToRepay.toInt256());
        emit Repay(_pool, _posId, msg.sender, _shares, amt);
    }
