Toyota Avalon clock, date and radio settings reset when car is turned off

I have a 2002 Avalon XLS with 160K. I recently had the clock spring replaced by a friend, which fixed what it was supposed to fix - airbag light went off, cruise works, horn works. He did disconnect the battery when he did the work.
Whenever I turn off the car, and turn it back on, the time and date have resent to default, and I lose all the radio settings like stations, bass, treble, etc.
I have to admit I'm not sure if the current problem started RIGHT after the clock spring work, or a bit later. I'm thinking I would have noticed it right away. But I know the time/date and radio settings did work right before.
I've scoured the internet and can't find an actual answer - a lot of "could be". My hope is that the "secondary, memory" power fuse is blown.
Any help would be GREATLY appreciated.
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