Regional Jet 700 ER/LR (CRJ700)
Training / Qualification
Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural Published Material / Policy
General Maintenance Action
Company Policy; Aircraft; Procedure
Working as a mechanic helper; removed electric hydraulic pump 3a from Aircraft X. [Ordered new] O-rings; [but] supervisor on duty instructed us to re-install old hydraulic pump back in the aircraft and also did not service hydraulic system.  Learned next day by management aircraft was back in service.Supervisor did not followed established procedures.
[Report narrative contained no additional information.]
Maintenance Technician and helper reported being instructed to reinstall a part because replacement parts were not in stock.