A B737-200 IN CRUISE AT FL330 DECLARED AN EMER DUE TO LOSS OF #1 ENG DRIVEN HYD PUMP PRESSURE.

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JUST PRIOR TO TOD; FO AT CTLS; AUTOPLT 'B' TRIPPED OFF. WE HAD BOTH 'B' HYD PUMPS FAIL AND #1 ENG 'A' HYD PUMP FAIL. SELECTED 'A' AUTOPLT. 30 SECONDS LATER; 'A' AUTOPLT TRIPPED OFF. BOTH ENG HYD PUMPS 'A' AND 'B' FAILED AND BOTH 'B' HYD PUMPS STARTED WORKING AGAIN. WE HAD NO LOSS OF HYD QUANTITY JUST 'A' SYS PRESSURE FAILURE. WE RESET THE ENG HYD SHUTOFF VALVE CIRCUIT BREAKERS AND ENG HAD SWITCHES; NO EFFECT. CAPT TOOK CTL OF THE ACFT AND FO RAN LOSS OF 'A' SYS HYD CHKLIST. THIS CHKLIST WORKED VERY WELL. IT MADE OUR MANUAL GEAR AND ALTERNATE FLAPS EXTENSION PROCESS EASIER. WE LANDED WITH 15 DEGS FLAPS AND MEDIUM AUTOBRAKES AND STOPPED ON THE RWY. THE FIRE CHIEF INSPECTED THE ACFT AND FOUND NO LEAKS OR FIRES. THE ACFT WAS TOWED TO GATE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE RPTED FIX WAS REPLACEMENT OF THE HYD FILTERS AND THE COCKPIT OVERHEAD HYD PANEL WHICH CONTAINED THE HYD PUMP CTL SWITCHES. THE RPTR SAID THE ACFT WAS RUN AND ALL HYD PUMPS OPERATED NORMALLY.