What was found
UPON BLOCKING IN TO GATE, A MX TECHNICIAN TOLD GROUND CREW TO TELL US TO BLOW FIRE EXT. ON ENGINE #1 DUE TO TAILPIPE FIRE. FIRED BTL 1 ON NR 1 ENG . HAD NO INDICATIONS OF FIRE/FIRE WARNING. UPON INSPECTION #1 ENG. NO VISIBLE DAMAGE OBSERVED. PERFORMED TURBINE EXHAUST CASE MODULE VISUAL EXAMINATION, IAW AMP 72-54-00-00AAA-310A-A. NO DEFECTS NOTED. PERFORMED VISUAL EXAMINATION AFTER EXTINGUISHER AGENT CONTACT, REF. AMP 72-00-00-07AAA-0B5A-A. NO DEFECTS NOTED. NO EGT LIMIT EXCEEDANCE NOTED. ENGINE IDLE RUNS SATISFACTORY WITH NO ABNORMALITIES NOTED. REMOVED AND REPLACED LEFT ENGINE FIRE EXTINGUISHER, REF AMP 26-21-05-01AAA-720A-A. OPERATIONAL TEST GOOD, REF. A220 AMP 26-21-05-01AAA-320A-A. PERFORMED POWER ASSURANCE TEST A220 AMP 71-00-00- 01AAA-320. (995837). NO FURTHER MAINTENANCE ACTION NECESSARY. A/C OK FOR CONT. SVC. (LP# 9612342; AIRCRAFT WAS GROUNDED)