how to look at settings on cisco 1841?

have a cisco 1841 that the old "can't find him anymore" computer guy set up years ago.  runs like a champ.  while back, i with the help of a wonderful user from here i did a port forward so an app on my phone could connect to one of the pc's on the network and get info from it.  everything worked fine for weeks until last week out the blue.  the app wont connect to the pc anymore, getting an "unable to connect to server" now.  pc and software seem to be running fine but cant completely eliminate it as the issue.  

but i want to eliminate the router as the issue.  i did email and left messages for the old computer guy to help me originally and never heard back.  he does have the login info and want to make sure he didn't log in and delete the forwarding info i had put in.

what is the commands to see the port forward config?  is there a log of recent logins i can pull up?  no one should have logged into it since the day i configured the port forward.  Thanks much in advance.
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You can see logs with
# show log
command, but depends on how log is configured depends what type of messages you wil be able to see, and how far in the past.
If someone reconfigured your config you can see messages like
Jun 10 19:11:37.935: %SYS-5-CONFIG_I: Configured from console by Crni on vty0 ( ^

you can check port forward config with
# show run | inc ip nat
and also check does the same port forward is found in startup config
#sh start | inc ip nat
Port forward command looks like
ip nat inside source static tcp 1 3389 interface FastEthernet4 3389

maybe port forward was issued on router, but never was copied to startup configuration and there was some power outage, or something like that.
And by issuing
#show version
you can check when your router last time was power cycled.
C881 uptime is 1 day, 14 hours, 25 minutes

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