I didn’t get such a good vibe when seeing the corrosion presented around the externals:
And naturally the insides didn’t look too optimistic… (but this hasn’t been enough to decline repair in the past)
However despite being one of the worst examples (with corroded broken tracks under the 10 way IDC socket too!), neutralised all the leaked alkaline, fitted a lithium replacement battery on a holder (and charge-blocking diode) and cleaned up and fixed numerous tracks…
Had to install wires as too far for solder bridges to work:
… ends up all good and working again!