import arcpy, os
arcpy.env.overwriteOutput = True
arcpy.env.workspace = r"C:GISSharejehmannTESTING.gdb"

workspace = r"C:TEST"
outdata_1 = r"C:GISSharejehmannTESTING.gdbJeffNotes_SHLs"

# Copy New Version of the Feature Classes

try:
    arcpy.CopyFeatures_management('Notes_SHLs', 'JeffNotes_SHLs')
    print "SHLs Feature Class Created Succesfully!"
except:
    print "Failed to Create SHLs Feature Class"


for dirpath, dirnames, filenames in arcpy.da.Walk(workspace, topdown=True):
    arcpy.env.workspace = dirpath
    mxds = arcpy.ListFiles('*.mxd')
    for filename in mxds:
        print "------------------------------"
        print filename
        mxd = arcpy.mapping.MapDocument(os.path.join(dirpath, filename))
        for layer in arcpy.mapping.ListLayers(mxd):
            if layer.supports("DATASOURCE"):
                print "{} -> {}".format(layer.name, layer.dataSource)
                if '%Notes_SHLs%' in layer.dataSource:
                    layer.replaceDataSource(layer.dataSource, "FILEGDB_WORKSPACE", outdata_1)

        mxd.save()