What was found
REF TC N8010004 ITEM F(6). NR 1 ENG BLEED AIR CROSSOVER CHECK FAILED. GROUNDED-YES. ACCOMPLISHED GVI OF ENGINE BLEED AIR DUCTS RELATIVE TO THE CORE FOR LOOSE SENSE LINES OR POSSIBLE LOOSE CLAMPS, NONE FOUND. ACCOMPLISHED TASK CARD NUMBER NG-36WC-00001 ENGINE BLEED AIR HEALTH CHECK, ALL TESTS PASSED. NO FAULTS FOUND 66641. REMOVED & REPLACED PRSOV, REF B737-800 AMM 36-11-04. LEAK & OPERATIONS CHECKS GOOD. PERFORMED ENGINE BLEED AIR CROSSOVER OPERATIONS TEST, PER AMM 36-11-00, ALL TESTS PASS.