On Thursday, November 21, 2013 7:57:17 PM UTC-8, OldGuy wrote:

Electronic flash has corroded electrical contacts. Duracell AA
batteries leaked. The contacts are molded into a plastic holder
and cannot be easily removed.

Don't use acid -- use household ammonia, followed by an alcohol flush.

If this doesn't fix it, go to Duracell. They have a "no-leak" warranty, and
will repair or replace the unit. This happened several years ago with my
dictating machine, and Duracell made good on its warranty.