What was found
IN DESCENT AT FL 270, PUSHED RECALL & R. PACK LIGHT ILLUMINATED. EXTINGUISHED UPON MASTER CAUTION RESET. GROUNDED - YES. PERFORMED BITE #2 PZTC REF B737-900 FIM 21-62 TASK 801 FOUND (SRADA EXIT) FAULT ON #2 CTC REF FIM 21-62 TASK 854 BITE DOES RESET. REMOVED AND REPLACED RAM AIR EXH ACTUATOR PER B737-900 AMM 21-51-27/401. ACCOMPLISHED PACK ZONE TEMP. BITE PER AMM 21-61-00-700-806-002. BITE TEST PASSED.ADJUSTMENT TEST PASSED PER AMM SUBTASK 21-51-27-860-014.