What was found
FT # 1106, DISPATCH ADVISED MCC THAT THE A/C WAS RETURNING TO THE FIELD FOR A PRESSURIZATION ISSUE. THE #1 PACK IS CURRENTLY ON MEL, BLEED #2 FAILED. CAPTAIN REPORTED INTERMITTENT FAULT ON PACK 2 WHEN BLEED 2 FAULT OCCURRED. BLEED 2 FAIL ( ENGINE BLEED SYS - SINGLE - ICING OK ); UPON TROUBLESHOOTING ON #2 ENG BLEED 2 FAULT FOUND AN AIR LEAK FROM NACELLE PRSOV VALVE TO THE PRECOOLER DUCT. REMOVED AND REPLACED E SEAL AT THE PRECOOLER AND ENG LINE DUCT. RAN ENG NO FAULTS AND LEAKS. RESTORE A/C TO NORMAL CONFIGURATION MDDR 384244 CLEARED PLACARD REMOVED OPS CHECK OK PER AMM 36-11-03.