What was found
AFTER TAKE OFF, RAISED THE GEAR AND HAD AN UNSAFE LEFT MAIN INDICATION BOTH ON THE INDICATOR AND SYNOPTIC PAGE. QRH FOLLOWED AND AFTER RAISING THE GEAR A SECOND TIME WE GOT A SAFE INDICATION. SUSPECT SENSOR WAS ICED OR COVERED DUE TO THE SNOW STORM AND THE A/C SITTING ON THE RAMP IN MEM. NTERROGATED PSEU REF. FIM-31-71-00. NO FAULTS NOTED. PERFORMED FIM-32-30-03. NO FAULTS. COMPLIED WITH TEST OF PROXIMITY SENSORS AMM-32-61-15. NO FAULTS INDICATED. NO HISTORY OF DISCREPANCY LAST 30 DAYS, SYSTEM OKAY FOR SERVICE.