AN MD88 CAPT REJECTED A TKOF AT ABOUT 80 KTS AFTER A SLAT OVERSPEED AURAL ANNUNCIATION OCCURRED AND EPR ARROWS ROLLED BACK WITH NO PWR LOSS.

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WE WERE FLYING FROM ZZZ TO ZZZ1. WE WERE ASSIGNED AN ACFT THAT HAD BOTH THE AUTOTHROTTLES AND AUTOSPOILERS INOP. WE REVIEWED THE MEL AND PROCS TO BE USED WITH THESE ITEMS NOT AVAILABLE TO US. THE THRUST RATING PANEL WAS NOT AFFECTED AND WOULD BE USED TO SET TKOF PWR. WE ELECTED TO USE THE LOWEST FLEX PWR RATING GIVEN TO US ON OUR ACFT WT AND BAL SHEET. THIS PROVIDED A HUGE CUSHION BTWN OUR WT AND THE RWY ALLOWABLE TKOF WT ON THE ACFT WT AND BAL SHEET. WE TAXIED OUT TO RWY 27; THE FO WAS TO FLY THIS LEG OF THE FLT. WE WERE CLRED FOR TKOF; BROUGHT UP THE THRUST LEVERS TO ABOUT 1.30 EPR'S AND CALLED FOR ME TO SET TKOF PWR. BEFORE TKOF PWR HAD BEEN REACHED; WE GOT A SLAT OVERSPEED WARNING. THE AIRSPD IS BELIEVED TO BE LESS THAN 80 KTS. ALMOST SIMULTANEOUSLY; THE EPR ARROWS ON BOTH ENGS APPEARED TO EXTINGUISH AND ROLL BACK EVEN THOUGH NO APPARENT LOSS OF PWR WAS SENSED. THE THRUST RATING PANEL SHOWED A NO-MODE INDICATION AND THE EPR TARGET WINDOW SHOWED DASHES WHICH IS CONSISTENT WITH THE NO MODE (ABNORMAL BLEED) INDICATION. I DISCONTINUED THE TKOF. I BELIEVE THE AIRSPD TO BE LESS THAN 80 KTS. WE RETURNED TO THE GATE FOR MAINT. WE LOGGED THE SLAT OVERSPEED WARNING IN THE ACFT LOGBOOK. I WAS NOT SURE HOW TO LOG THE FAULTY ENG INDICATIONS. I HAD 2 PHONE CALLS WITH OUR MAINT SUPVR; AND HE SAID HE HAD A COURSE OF ACTION ON THE PROB. CALLBACK CONVERSATION WITH RPTR ACN 784459 REVEALED THE FOLLOWING INFO: THE CAPT STATED THAT HE DOES NOT HAVE ANY DEFINITIVE INFO FROM MAINT ABOUT THIS EVENT. THE ACFT WAS PUT BACK INTO SVC BUT WITHIN A DAY OR TWO HAD A SECOND SIMILAR EVENT AND WAS MAINT FERRIED TO A MAJOR OVERHAUL FACILITY. THE RPTR PERSONALLY SUSPECTS THAT BECAUSE OF RECENT HVY RAINS IN THE AREA; THERE IS A POSSIBILITY THAT WATER GOT INTO VARIOUS COMPONENTS. ONE WAY SOME CREWS DEAL WITH THE EPR ISSUE IS TO TURN ON ENG HEAT PRIOR TO TKOF FOR A SHORT PERIOD OF TIME. CALLBACK CONVERSATION WITH RPTR ACN 785365 REVEALED THE FOLLOWING INFO: RPTR STATED THAT THE ONLY INFO HE HAD ABOUT THIS EVENT WAS WHAT HE HAD HEARD FROM THE CAPT.