Diagnostic Service Call on 1993 Ruud Heat Pump. Service work performed: Here for no cool on 27 year old Heat pump system. Indoor blower is coming on but outdoor unit is not coming on. Indoor airflow seems marginal. Outdoor unit came on when I Reset the high pressure cutout. Checked charge, superheat and subcooling are way out of range. Superheat is only at a 1, and Subcooling is at 15. Accumulator and compressor are rusting severely. Contacts are pitted and burnt, and compressor amps are high. System is operational at this time but not running very well. Would strongly consider replacing. Cannot guarantee the high-pressure cut out will not continue to trip due to higher than normal head pressure. Provided customer with estimate on replacing system.