Gearbox
The EU 702 has a page which reads something like
Read Codes
Store Codes
Erase Codes
Just scroll down to the erase codes and press OK light out. Remember if you haven't repaired the fault it will come back.
Regarding the Volvo specific codes they indicate poor connections, have you tried unplugging the main transmission harness on top of the box and cleaning the plug and socket with electrical contact cleaner?
The see if it improves things.
With the EU 702 you can store codes in the reader for reference later
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