sa_scenario sa_conversation "Repair request and measured reply" id "730b27ca-b039-5a3b-8dc6-03418f9061b3" {
    context @sa_restore;
    postcondition "The controller has received the measured pressure after repair";
    precondition "A pressure alarm has been assessed";
    steps [@sa_call, @sa_reply];
    viewpoint BoundaryInterface;
}

sa_occurrence sa_call "Request valve repair" id "8bab4783-a098-5984-9e36-493957caf26c" {
    body {
        Exchange {
            exchange @sa_contact;
            message_kind Call;
            receiver @sa_responder;
            sender @sa_caller;
            values [{
                expression "420.0";
                field @sa_pressure_parameter;
            }];
        };
    };
    parent @sa_conversation;
}

sa_lifeline sa_caller "Controller" id "98c61788-2fee-51f4-8cf9-de48e8c70e9e" {
    parent @sa_conversation;
    represented @sa_control;
}

sa_occurrence sa_reply "Return pressure after repair" id "4e1c0a56-ce80-5f13-a93a-6956de54880c" {
    body {
        Exchange {
            exchange @sa_contact;
            message_kind Reply;
            receiver @sa_caller;
            reply_to @sa_call;
            sender @sa_responder;
            values [{
                expression "320.0";
                field @sa_pressure_parameter;
            }];
        };
    };
    parent @sa_conversation;
}

sa_lifeline sa_responder "Technician" id "6249b54a-e396-5338-82b9-89266c55670d" {
    parent @sa_conversation;
    represented @sa_technician;
}

artifact repair_test_evidence "Repair conversation acceptance notes" id "f5922bf7-05d8-590f-86e9-1d09f37f4fa6" {
    description "A local teaching artifact, not proof of a real valve's safety.";
    fragment "acceptance";
    owner @sa_conversation;
    relation Verifies;
    revision "lesson-1";
    uri "evidence/repair-check.md";
}