All recurring members expired 2012-12-31

I am running amember 3.1.6PRO. For some reason the author of amember used 2012-12-31 as the RECURRING expiration date and that means that since last night all my recurring members have been set to expired. Huge problem. So this is what I have been doing as of now:

1. I an the following SQL update code: select * from amember_payments where expire_date = '2036-12-31'; (I am using 2036 as that changes the subscription to RECURRING - 2037 changes it to LIFETIME.
2. Changed 2012-12-31 to 2036-12-31 in product_inc.php.
3. Changed all occurrences of 2012-12-31 to 2036-12-31 in paypal_r.inc.php

HOWEVER, this does NOT fix one huge problem, which is that all members that were mistakenly expired on 2012-12-31 are still shown to be expired! Which means nobody can log into my posts now. I have no idea how to fix this. This is a catastrophe and any help would be appreciated.

Correction - the SQL update I ran was the following: update amember_payments set expire_date = '2036-12-31' where expire_date = '2012-12-31';