I can't claim to be a real 'Old Tanker', but I'm certainly old and I've been tinkering with Radio Control Tanks for over 50 years now, (on and off).
Back in those days multichannel RC was quite expensive, so my first one was a 1/16 Panzer IV with a homemade single channel radio that stepped a rotary switch which sequentially gave left/right/forward/backward/turret etc.. etc.. So very Heath Robinson compared to nowadays but it seemed very impressive at the time.

I've since spent a lot more of my 'disposable income' on all things RC (yachts.drones etc).
I've recently bought a used non-working Tiger 1 with mostly metal parts with the intention of stripping it down and rebuilding and spraying it and adding a few extras, like FPV and an ELRS rx so that I can control it with my TX16s.
It's mostly in good shape, with the premium (black gear) motors working ok, but the fault appears to be with the v3 MCU. When I power it up (with a good fully charged NIMH), the fan runs but none of the controls have any effect after binding. So I'm wondering if the board is blown or just the RX part. I notice it has the ability to be driven from an external rx by connecting each servo channel, but those bespoke leads are missing, so I don't know whether to buy a new set or just buy a new MCU in case the board itself is U/S.
I'd make up the servo leads myself, but I can't identify the type of tiny 3pin sockets on the MCU.
I'd be grateful for any advice and opinions on the best way forward to fix or upgrade the radio gear.
I found a youtube video where a Guy even went as far as using a new pair of Esc's and an RX, but I can't find it again.