Bodywork of the Vehicles other than as described in Clause 4.12; 6.1.14 repairs to the Chassis of the Vehicles; 6.1.15 repairs to the Bodywork as described in Clause 4.12 for a period of thirteen weeks from the Commencement Date; 6.1.16 damage or failure caused by corrosion of the Bodywork or Chassis; 6.1.17 upgrades, conversions and retrofits required due to the obsolescence of the original components used by the vehicle manufacturer; 6.1.18 repainting (other than to avoid leaving exposed bare metal following repairs described in Clause 4.12.4) or refurbishing of the Vehicles; 6.1.19 cleaning of the Vehicles save as necessary to complete the Maintenance Services; 6.1.20 traction battery (including boxes and connectors) replacement, maintenance (other than as described in Clause 4.10) and repair; 6.2 SEV shall upon request by DCL provide all or any of the Excepted Services but shall be entitled to charge for the same by levying Additional Charges in the manner described in Clause 7. 6.3 Without prejudice to Clause 6.2, SEV shall be entitled to levy Additional Charges in the manner described in Clause 7 if Maintenance Services are provided at DCL request in circumstances where it is agreed that DCL request was unnecessary. 7. Additional Charges 7.1 Rates for Additional Charges shall be increased annually in line with the last published Retail Price Index on the first day of each DCL Financial Year and stated in Schedule One effective for the following year of this Agreement. 7.2 Additional Charges shall be levied by SEV on completion of Excepted Services within fifteen working days otherwise DCL shall have no obligation to pay the Additional Charges. The Additional Charges shall be payable by DCL within fifteen working days of receipt of the invoice. 7.3 Additional Charges for labour and travelling time shall be levied at the rates stated