Has anyone replaced the RTC on a Police 911?

Up to you. You need something better than desolder braid though. You will burn and lift the traces with the excessive heat.
 
I just did a Jurassic Park 3 (I think it is the same boardset). The traces are pretty fine and closely packed around the RTC chip. If you don't solder often and don't have access to a decent desoldering setup, I would send it out. I used a Hakko 808 with the 1.0 tip and had to be extremely careful not to hit any of the other traces while desoldering.
 
I just replaced it on a Teraburst and it went smooth- but as has been said, the traces are small and you need the right tools. If I recall, you cant get under the chip to cut the pins before removing it- it has to be thoroughly desoldered all at once. I used a Hakko 808 and replaced it with a socket and new burned RTC.
 
Send it off to Robocop and start doing the cosmetic stuff on the game while it's gone, by the time you get it back you'll have everything ready to fire up
 
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