What was found
WITH RECALL, PACK LIGHT ILLUMINATED AND THEN EXTINGUISHED WITH MASTER CAUTION RESET, LEFT PACK. GROUNDED-YES. PERFORMED B737-800 FIM TASK 21-61-00, LEFT PACK SHOWS RAM AIR ACCT. REMOVED AND REPLACED LEFT PACK RAM AIR ACTUATOR, PER B737-800 AMM 21-51-51-000-801 AND 21-51-21-400. OPERATION CHECK GOOD AT THIS TIME. NO LIGHTS ILLUMINATED DURING OPS CHECK, BITE CHECK TEST CLEAR. THIS ACTION CLEARS MEL 21-32B, PLACARD REMOVED, SEAMC CHRIS NOTIFIED.