What was found
ON TAXI INBD SPOILERS SHOW DEPLOYED. WOULD NOT RETRACT. NR 8 SPOILER IS UP WITH ALL OTHER SPOILERS DOWN. STAYS UP UNTIL HYD IS TURNED OFF, THEN IT COMES DOWN. ALL OTHER SPOILERS NORMAL. NO INDICATIONS IN COCKPIT. NEED TO REPLACE NR 8 SPOILER PCU IAW MM. STARTED TO REMOVE NR 8 PCU. NEED TO COMPLETE REMOVAL AND INSTALLATION. REPLACED NR 8 SPOILER PCU. NEED TO ACP SPOILER PCU ADJ AND SPOILER OP CK. ACCOMPLISHED PCU ADJUSTMENT AND OPS CHECK. ALL NORMAL.