As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING OUT AT 22,000 FT NR 2 GEN FAULTED WITH IMMEDIATE ACRID ELEC SMOKE SMELL/FUMES. NO OTHER FAULTS. C/W ECAM. DECLARED EMERGENCY AND RETURNED TO KORD IN 19 MIN "MEL 24-23-01: APU GEN SYSTEM INOP." FOUND EVIDENCE OF WATER IN AREA OF NR 2 ENG GEN CONTROL UNIT. CLEANED RESIDUAL MOISTURE FROM AREA AND SWAPPED NR 2 GEN CONT WITH APU GEN CONT, DEFERRED APU GEN CONT UNIT. REF AMM 24-22-12-4. SWAP COMPONENT POSITIONS.