DETAILED) THE FOLLOWING ITEMS ON ALL PATS AUXILIARY FUEL CELLS FOR CONDITION AND SECURITY OF INSTALLATION: FUEL CELLS, FUEL CELL SUPPORT STRUCTURE, ELECTRICAL CONNECTORS AND CABLES, AND PLUMBING, INTERNAL CELL WALLS, PLUMBING SUPPORTS. VACUUM TEST EACH CELL PER PATS PS-4.1 PRIOR TO REINSTALLATION. 28.570 REF: BIC 28-88J-01-0