arcpy.MakeTableView_management("Join_Table", "GarbSeq", WC5)

print "made table"

with arcpy.da.UpdateCursor("GarbSeq", "CUSTID") as cursor:
    for row in cursor:
        row[0] = str(row[0]) + "001"
        cursor.updateRow(row)
print "UPDATED ROWS"

joinFc = "GarbSeq"
joinIdFld = "CUSTID"
joinValFld = "OLDSEQUENCE"

valueDi = dict([(key, val) for (key, val) in
             arcpy.da.SearchCursor
             (joinFc, [joinIdFld, joinValFld])])

Traceback (most recent call last):
  File "C:Python27ArcGIS10.2Libsite-packagespythonwinpywinframeworkscriptutils.py", line 323, in RunScript
    debugger.run(codeObject, __main__.__dict__, start_stepping=0)
  File "C:Python27ArcGIS10.2Libsite-packagespythonwinpywindebugger__init__.py", line 60, in run
    _GetCurrentDebugger().run(cmd, globals,locals, start_stepping)
  File "C:Python27ArcGIS10.2Libsite-packagespythonwinpywindebuggerdebugger.py", line 654, in run
    exec cmd in globals, locals
  File "N:CommonScriptDriversPrepCleanScapesUpdate.py", line 1, in <module>
    import arcpy
ValueError: too many values to unpack