Westinghouse Hydro Duplex 1964-1965 era. 7 stops. Type ES relays (piano key relays). Car calls == car only responds to 1st and 7th floor calls in the up direction. After going to 7th floor, stepping/notching resets then answers car calls perfectly in the down direction. Will not answer correctly in the up direction until it sees terminal floor at 7, then it answers those up calls in the down direction that were already logged or any new ones. PI reads 1, 3, nothing, nothing, nothing and then 7 on the way up. It answers 3 most of the time (for whatever reason). ONce in a while hoistway dispatching is OK because the PI reads 1,2,3,4,5,6, and then 7. It responds correcty, unequivocally, in up direction after shut off for 30 minutes or so. When something heats up after a while, car starts to act up again. Seems that notching or stepping causing the problem...but NA and NB are opening and closing correctly and reading correctly. Coils are giving right coil reading even when messing up.