CAWorkingGirl - I must disagree with you about the 3-day limit.
The 3-day provision only applies to the determination of an error. Issuance of a Chargeback is not a resolution, simply an action to an end. If a merchant response is received (Representment), a time table for the review of the information is not part of Reg. E. In fact, even if it is reviewed, you may not have reached a conclusion yet (you may need the consumer to review the information to assist with the investigation). Once you reach a conclusion only then does the 3-day time clock start ticking.
As far as the Chargeback credit goes, if you perform any Chargeback you must immediately credit the consumer account. Both Visa and MasterCard prohibit you from retaining any credit from a Chargeback that is due to the consumer. The issuance of a credit is not in and of itself resolution so long as the letter you send at that time states as much.
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My opinions do not necessarily reflect those of all the voices in my head.