What was found
INSPECTION TYPE: NA DIVERSION-NO EMERGENCY DECLARED-AC TAKEN OUT OF SERVICE. CLIMBING THROUGH FL 270 RECEIVED PACK 2 FAULT. ECAM DIRECTED US TO TURN PACK 1 ON, PACK 1 FAILED SHORTLY AFTER SELECTING IT ON. UNABLE TO REGAIN EITHER PACK, ECAM DIRECTED US TO DESCEND MAX ALTITUDUE OF 10,000 PER TECH SUPPORT FLT RECORDER INTEROGATION FOUND APU BLEED VALVE OPEN. WITH NO ENGINE BLEED TO PACKS. REMOVED AND REPLACED APU VALVE CONTROL RELAY, PER ASM 36-12-00 AND ESPM 20-46-50. ACCOMPLISHED APU BLEED TEST, PER 36-12-00 PG 501 AND ENGINE BLEED TEST, PER 36-11-00.