What was found
SUPPLEMENTAL (NEW) INFORMATION: REMOVED AND REPLACED #1 PACK HEAT EXCHANGER. OPS AND LEAK CHECK GOOD. REMOVED AND REPLACED HEPA FILTERS 1 AND 2. INSTALLED FLOOR PANELS 251FF AND 251HF. REMOVED AND REPLACED NO.0 CARBON SEAL ASSEMBLY. INSTALLED FAN SPANNER - LOCK NUT PLUG. INSTALLED FAN WHEEL ASSEMBLY. INSTALLED BACK FAN SPINNER. INSTALLED BACK THE FAN BLADE FORWARD RETAINER ASSEMBLY. INSTALLED BACK THE FAN BLADES. PERFORMED OPS AND LEAK CHECK OF NO.0 CARBON SEAL. LEAK CHECK FAILED. REMOVED AND REPLACED LH ENGINE.