Ditec sliding gate opener N/W.

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Hi, I'm trying to repair a ditec gate opener possibly around 20 years old. It stopped working, however when pressing the remote button, the 2 leds come on showing its receiving the signal. Zener diode 1 and 2 were overheated and 1 wasn't working. I've replaced them but it's still not working, no clicking of relays, just the 2 leds coming on. Ditec tried a few things when I took it to thier workshop but they can't help. The circuit boards are no longer being made. Large white capacitor is good as are the 3 micro switches.
Any help appreciated. 

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