DCN E1000883-V3 THE CORRESPONDING FORMAL DRAWING TREE, WHICH INCLUDES A PROPER PURCHASING BOM, IS: LIGO-E1000884-V3 THE DCN INCORPORATES REVISIONS AS FOLLOWS: ASSY D1002312-v3 (from -V2) - includes corrections to specification of positional tolerance on Sheet 1, zones D5 and F7, as well as corrected dimensions in Detail D on Sheet 2. ASSY D1002455-v3 (from -V2) - includes corrections to specification of positional tolerance on Sheet 1, zones D6 and E8, as well as corrected dimensions in Detail D on Sheet 2.