What was found
FOUND #2 ENGINE MAINT MSG 75-10592, THE TBV POSITION SIGNAL IS OUT OF RANGE. LONG TIME FAULT DEFERRED PER T/C 78273000. GROUNDED - YES. DEFERRED PER T/C 78273000. PLT DEFERRAL FOR 450 FLT HRS. ACCOMPLISHED B737-800 FIM 75-23 TASK 802. ACTUATORS TEST PASSES. FAULT ACTIVE ON LEG 8 HOWEVER. ACCOMPLISHED FIM 75-34 TASK 811. FOUND RESISTANCE VALUES OF THE TBV OUT OF LIMITS PER STEP H. (2). RANG 97 OHMS. PINS 2-3 ON DP0907. TBV REQUIRES REPLACEMENT. REMOVED AND REPLACED TRANSIENT BLEED VALVE REF B737-800 AMM 75-23-01. OPS TEST GOOD NO LEAKS NOTED. THIS CLEARS PLT.