Not diagnosing anything bud...just mentioning how it was back then. Certain allowances need to be made when you're rocketing down the highway with lights & siren going.
Back in the First Responder/Rescue Squad days the general rule of thumb was a systolic BP of 100 + the patients age, while not being considered marathon runner level, was sufficient to support life.
Something to try that won't cost anything other than some di-grease...disconnect, clean and apply di-electric grease to all connections including all fuses...seen this solve some strange electrical issues.