Custom Bid for Services- Overhauling charges for CCB II brake system valves make Knorr Bremse provided in 3 phase Electric locos including provision and changing of must change spares and conditional basis spares 06 no, Custom Bid for Services- Optional items to be replaced on conditional basis overall ceiling limit 12 percent of total estimate cost for overhauling cost lumpsum, Custom Bid for Services- GST 18 Percent