ESQ-1 Record Mode

Hi all,
I bought my ESQ-1 in 1987 and it always works fine. No, after two years storage in a case in a dry room, I got the synth working again by reseating all Ics and plugs. (Vers.3.5)
The only thing with malfunction is to record a sequence. There’s no way to switch into record mode. (record+play button) The play button works, but no Metronome.
With all tests the record button works. I’ve also made the soft and hard reset, no changes.
Any ideas?