A B737-700 PRIOR TO DEP RPTED FO'S PFD HAD SPD AND ALT FLAGS. TECHNICIAN REALIGNED THE #2 IRU.

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ACFT X WAS AT THE GATE AFTER REMAIN OVERNIGHT AT ZZZ. PRIOR TO PUSHBACK FOR THE FIRST FLT OF THE DAY; THE CAPT CALLED MAINT LEAD VIA RADIO AND RPTED ELECTRICAL FAULT LIGHT ILLUMINATED. I WAS DISPATCHED TO THE ACFT AND CONFIRMED THE PROB. I CONDUCTED AN OPS CHK OF THE STANDBY PWR CTL UNIT PER THE TASK CARD AND CONFIRMED THE BATTERY CHARGED POSITIVE SO I COULD MEL THE DISCREPANCY AND DISPATCH THE ACFT. PAX WERE ALREADY LOADED ON THE ACFT. I RETURNED TO THE LINE TO CONTACT MAINT CTL AND COMPLETE THE PAPERWORK. THE LEAD INFORMED ME THE ACFT HAD A SIMILAR DISCREPANCY BACK IN AUGUST. AT THAT TIME THE STANDBY PWR CTL UNIT HAD BEEN RESET AND THAT CURED THE PROB. I RETURNED TO THE ACFT AND INDIVIDUALLY PULLED EACH CIRCUIT BREAKER ON THE STANDBY PWR CTL UNIT IN HOPES OF RESETTING IT. I INADVERTENTLY SECURED ACFT PWR. THE APU WAS RESTARTED AND PWR RESTORED. THE ELECTRICAL FAULT LIGHT REMAINED ON; SO I RETURNED TO LINE MAINT TO COMPLETE THE MEL PAPERWORK. WHILE AT THE LINE; THE CAPT RADIOED AND STATED THE FO'S SPD AND ALT FLAGS ILLUMINATED ON HIS PFD. I CALLED TECHNICAL SVCS WHO INFORMED ME THE SPD AND ALT INFO CAME FROM THE ADIRU. I RETURNED TO THE ACFT AND PULLED AND RESET THE #2 ADIRU AC; EXC; AND DC CIRCUIT BREAKERS. I FELT THE #2 ADIRU FAILED TO PWR UP PROPERLY AFTER THE LAST PWR DOWN. IMMEDIATELY AFTER THE #2 ADIRU CIRCUIT BREAKERS WERE RESET; THE FO'S PFD INDICATIONS WERE RESTORED TO NORMAL. I WAITED FOR #2 INERTIAL REF UNIT TO ALIGN AND THE MAP DISPLAY RETURNED TO NORMAL ALSO ON THE FO'S SIDE. I THEN CLRED THE LOGBOOK ENTRY MADE BY THE CAPT. I PERFORMED NO MAINT MANUAL OR TASK CARD PROC; AND FEEL THE FO PFD DISCREPANCY WAS AN OPERATIONAL ISSUE. HAD THE PLTS TURNED OFF THEN REALIGNED THE #2 IRU WITH THE OVERHEAD PANEL SWITCH; THIS DISCREPANCY WOULD HAVE CLRED. AFTER I COMPLETED THE PAPERWORK; THE ACFT WAS DISPATCHED. I WAS INFORMED BY MY LINE MAINT MGR THAT AN INITIAL NOTIFICATION OF APPARENT VIOLATION HAD BEEN INITIATED. SELF DISCLOSURE #XX-XXXXX THAT I HAD FAILED TO DOWNGRADE THE LOWER WX MINIMUM PERFORMANCE STATUS OF THE ACFT. I FILED AN ASAP RPT WITHIN 24 HRS (REF XXXX-XX. I DIDN'T FEEL THE CAT STATUS HAD BEEN COMPROMISED SINCE I DID NOT TOUCH AND LOWER WX MINIMUM PERFORMANCE SENSITIVE LINE REPLACE UNITS OR COMPONENTS. I DID NOT WANT TO COMPLETELY PWR DOWN THE ACFT AGAIN WITH PAX ON BOARD; SO UTILIZED THE CIRCUIT BREAKERS TO REBOOT THE ADIRU; WHICH WORKED.