AN MD80 WAS DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT COCKPIT OVERHEAD ANNUNCIATOR LIGHT PANEL INSTALLED.

Narrative

RECEIVED ACFT IN ZZZ WITH PROB WITH 'PITOT/STALL HEAT FAIL' ANNUNCIATOR LIGHT COMING ON INFLT. MAINT CHANGED FULL ANNUNCIATOR PANEL. RAN ALL CHKLISTS; TESTED PANEL; FOUND ALL LIGHTS AND BLANKS LIGHTING NORMALLY. WE FOCUSED ON THE PITOT HEAT WARNING WHICH SEEMED FINE. MAINT GAVE US LOGBOOK; DOOR WAS CLOSED; AND FLT PROCEEDED TO BWI WITHOUT ANY APPARENT PROB. FIRST SIGN OF TROUBLE WAS FIRST LIGHT TO COME ON AT GATE WAS THE AFT CABIN DOOR OPEN; BUT DID NOT PURSUE IT; AS I THOUGHT THEY MAY HAVE OPENED IT FOR SOME KIND OF SVC. I WENT INSIDE AND GOT BOGGED DOWN TRYING TO GET A COPY OF FLT PLAN/RELEASE FOR THE NEXT FLT. WHEN I FINALLY GOT BACK TO THE ACFT; I NOTED A LIGHT ON INDICATING THE ELECTRICAL EQUIP BAY DOOR WAS OPEN. I THOUGHT THEY WERE STILL WORKING ON THE PITOT HEAT PROB; BUT I WENT DOWN AND FOUND THE DOOR CLOSED. I CHKED IT AGAIN AND WENT UP AND FOUND THE SAME LIGHT ON. THE CAPT TRAINEE (ALSO A CHK PLT) WENT DOWN AND TRIED CYCLING IT HIMSELF. I FINALLY REALIZED THAT THERE WERE SEVERAL LIGHTS WERE IN ERROR AND THEN REALIZED THAT MAINT HAD PUT A DC9-30 PANEL INTO AN MD80. SEVERAL CALLS CONFIRMED AN IMPROPER PART. WE ENDED UP STUCK FOR ALMOST 7 HRS BEFORE A GOOD PANEL WAS REPLACED. WE FELT BAD NOT CATCHING THIS INFLT; BUT WE PUSHED TO TEST; GOT ALL LIGHTS ILLUMINATED. THE DOORS WERE CLOSED AND WITH NO LIGHTS ON WE COULD NOT SEE A PROB. IN THE FUTURE; I SUPPOSE WE WILL HAVE TO CHK THAT THE INDIVIDUAL LIGHTS ARE CORRECTLY LOCATED. WE WERE DIVERTED BY THE PITOT HEAT WRITE-UP AND DID NOT REALIZE ANOTHER PROB COULD DEVELOP. I WILL TRY TO PRACTICE MORE VIGILANCE.