A833 - Identification and HELP!!

Hi Gents

I had the gearbox "Checked out" during body work stage and "all looks good" was my response.

Now that I finally got my RestoMod Electrical work done and ready to run for the first time since I picked up my project 2 years ago I have a nasty grinding sound in 1st and 2nd gear.

First and foremost - I have these codes on the housing and was hoping I can get as much info as possible by decoding them.

Secondly, can anyone (after decoding my gearbox) recommend a good quality Overhaul Kit and/or sourcce for Parts so I can rebuild it well?

Many thanks in advance from waaay south of the Border. Here are some Pics of its current state and the previously mentioned codes.

TJ

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My A833 Code number 1.PNG

My A833 Code number 2.PNG