Respondent was assessed a civil penalty of $7,600 for four violations of the HMR when it represented, marked, and certified DOT specification and special permit compressed gas cylinders as qualified for continued service on days when it failed to verify the accuracy of its hydrostatic retest equipment to within ±1.0% at pressures within 500 psi of the pressures at which it retested cylinders (violation No. 1); failed to maintain complete and accurate records of calibration and retest (violation No. 2); allowed employees to perform functions subject to requirements in the HMR when the employees had not received hazmat employee training (violation No. 3); and failed to notify PHMSA of a change of personnel performing cylinder requalification testing within 20 days of the change (violation No. 4).