Vendor shall perform Corrective Maintenance as needed to restore the Elopement Prevention and Card Access Systems to working order. Vendor shall bill for Corrective Maintenance on an hourly basis. 4.1.2.2 Vendor shall respond to Corrective Maintenance calls from Agency by phone within four (4) hours and must arrive on site to begin performance as soon as possible, but no later than twentyfour (24) hours after Vendor is notified of the request. Vendor may only deviate from the required twenty-four (4) hour response time with written permission from the Agency. 4.1.2.3 Corrective Maintenance must be performed between the hours of 8:00 A.M. and 3:00 P.M., Monday through Friday, excluding Holidays, unless the Agency approves work at another time, in writing. 4.1.2.4 Vendor shall not perform any maintenance under this contract without prior approval from Agency...