What was found
WEATHER RADAR DEPICTS CELLS IN BOTH AUTO AND MANUAL MODES WHERE NO WEATHER EXISTS. AUTO MODE DOES SEEM MUCH WORSE AS TO FALSE DEPICTION BUT MANUAL MODE STILL BAD. PREDICTIVE OVERFLIGHT WARNINGS, LIGHTNING PREDICTION, AND MATURE CELL THREAT ICONS ARE INTERMITTENTLY PRESENTED. RADAR TILT IS FUNCTIONAL AND AT HIGHER ELEVATION TILT 6 PLUS DEGREES IN MANUAL MODE RETURNS FINALLY ARE GONE. IN AUTO MODE WITH GAIN TO ABSOLUTE MINIMUM (ZERO GAIN) RETURNS OF HEAVY INTENSITY ARE STILL PRESENT. GROUNDED - YES. RELEASED PER MEL 34-15D WX RADAR INOP. ACCOMPLISHED WEATHER RADAR SYSTEM OPERATION TEST BITE REF B737-900 AMM 34-43-00 AND B737-900 FIM 34-43 TASK 801 WITH NO DISCREPANCIES. REMOVED WXR R/T, INSPECTED CONNECTORS, NO DEFECTS FOUND, REINSTALLED R/T REF AMM 34-43-41. REMOVED/REPLACED RADAR PEDESTAL PER AMM 34-43-11-400-802 & ANT PLATE PER AMM 34-43-11-400-801. PERFORMED WXR SYSTEM OPERATIONAL CHECK PER AMM 34-43-00-710-802-001 OPS CHECKS GOOD. THIS CLEARS MEL 34-15D.