What was found
ENGINE #2 FIRE WARNING B LOOP DOES NOT TEST GOOD. GROUNDED - YES. REMOVED AND REPLACED UPPER FAN FIRE DETECTOR LOOP ON #2 ENGINE IAW B737-800 AMM 26-11-01-000-803 OPS CHECK BAD FAULT STILL EXISTED. REMOVED AND REPLACED ENGINE AND APU FIRE CONTROL PANEL IAW AMM 26-00-01-400-801. OPS CHECK BAD FAULT STILL EXISTED REMOVED AND REPLACED ENGINE AND APU FIRE DETECTION MODULE IAW AMM 26-10-01-400-80. OPS CHECK BAD FAULT STILL EXISTS. ACCOMPLISHED ENGINE AND FIRE CONTROL PANEL INSTALL AMM TASKS 26-10-00-710-801, 26-21-00-720-802, 26-21-00-730-802, 26-22-00-720-801, 26-22-00-730-802, 26-18-00-710-801. ALL TEST'S PASSED.