Some object and line missing while ploting PDF for the Autocad 3d drawing

Dear Autodesk Support Team,

We are facing the problem of some object/line missing while ploting/PDF for  the Autocad 3d drawing.

We also tried for "HIDEPRECISION=1" command , even then not displaying it.

Then we use "OBSCUREDLTYPE=1" then the missing object display but other all lines get too dark in the same drawing .

For sample , I have attached one pdf , in which you can see the missing line and object marked with bluecolor box.

Please let me know any other solution to display the missing object.

We are using :

Software :  Autocad 2012-64Bit , NAviswork 2013 , Autoplant Piping V8i - SS4 version : 8.11.9.140 , MS-Office 2010 64 Bit.

Hardware : Workstation Dell Precision T3600

Waiting for your earliest reply, as lot of work is pending , please reply soon .....

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