What was found
(CAN) NR 1 ENGINE 13TH STAGE BLEED MANIFOLD WAS MODIFIED TO FIT THE NR 2 ENGINE AT AN UNKNOWN LOCATION USING A NON-PRATT APPROVED REPAIR. THIS CONFIGURATION MAKES IT IMPOSSIBLE TO INSTALL THE ENGINE BLEED MANIFOLD. PART WAS FOUND INSTALLED AFTER RETURN FROM A SHOP VISIT, THE PART WAS NOT SUPPLIED BY AIR CANADA. SUSPECTED PART WAS REPLACED BY THE APPROPRIATE PART (P/N 545708). SUBMITTER STATED SUSPECTED PART IS QUARANTINED AND DISCREPANCY LETTER SENT TO OVERHAUL FACILITY. PART TC: 57,257.