fixed two scripts, others are still not working

[lingenavd]

I am using a: 7390 with FRITZ!OS: 06.86
with a fresh (non docker) install of Munin version 2.0.49 on ubuntu server (on raspberry 4 (arm64))

I fixed these two scripts:
/usr/share/munin/plugins/fritzbox_connection_uptime.py
/usr/share/munin/plugins/fritzbox_traffic.py

using this URL to fix it:
https://bitbucket.org/kbr/fritzconnection/issues/37/unknown-service-wancommoninterfaceconfig-1
I changed the "WANCommonInterfaceConfig" into "WANCommonIFC"
and respectively:
"WANIPConnection" to "WANIPConn"

The rest of the scripts is using uPNP and I can't get them to work properly.
for instance the script: "fritzbox_cpu_usage.py"
gives the following error:
No JSON object could be decoded
Couldn't retrieve fritzbox cpu usage

I will try to troubleshoot and fix it myself and let you know but any help is appreciated.

grtz,
Andre