Finally today I was able to put in for the transfer for this domain... learned two interesting things. First, thanks to Brooke:
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For domain transfers we must rely on the whois information. Unlocking it at the registry level allows you to make changes with the registrar you currently have, but to transfer it to another registrar the changes have to have been applied to the whois information as well.
And second, the lock status doesn't (or didn't in this case) update as quickly as changing a domain contact. I first unlocked, waited 24 hours, then made a contact change as a test when the domain still showed up as locked in the whois. The contact change showed up in 12 hours, but it took another 12+ for the lock to finally vanish in the whois.