What was found
BOTH PLENUMS ON RH PRIMARY AND SECONDARY HEAT EXCHANGERS DAMAGED. GROUNDED - YES. REMOVED BOTH RH PRIMARY AND SECONDARY HEAT EXCHANGERS AND PLENUMS. REF B737-800 AMM 21-51-03-000-805-002. INSTALLED NEW PLENUMS ON PRIMARY AND SECONDARY HEAT EXCHANGERS. POSITIONED RH PRIMARY HEAT EXCHANGER ON AIRCRAFT AND HAND TIGHTENED MOUNT BOLTS. REF AMM 21-51-03-400-804-002. INSTALLED SECONDARY HEAT EXCHANGERS PLENUM AND COMPLETED GOOD. REF AMM 21-51-03 COMPLETED FINAL.