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To give some actual advise... We do not give out defaulting or codes here for security reasons. The control panel is pretty old and I assume you have no record of it's service history? Most 4 zone Optima's in the wild are at the point were they have done there time. They are either unreliable, keypad worn out, black burn marks on the PCB and plastics and/or take over 3 weeks to charge a battery properly. The most sensible suggestion would be to swap the control panel and possibly sounder for something modern that comes with instructions you can read over a cuppa. If you are not confident in doing this maybe get someone to come and have a look and quote an upgrade.

You need a key for the zone omit unit above. Once you have it omit the zone (it will buzz) open the safe, close the safe and un-omit the zone.

Leave it in your freezer over night in a plastic bag and it defaults