Mono Amps

I own a Adcom GFA5500 and interested in bridging to mono. If I get another 5500 can they be bridged as mono?
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The correct answer will come from ADCOM.
Looking at the owners manual and the back of the unit, I don't think you can bridge the GFA5500. Seems to be (2) channel stereo only. Maybe they could be sent in to rewire to mono, but they are not user switchable.

I did check the website but there is not much on the topic. I have heard from others and told they are bridegable butdo not know how to go about it.If I can do it I will be looking for another 5500