Iam not going with the Boron defiency. Your plant looks good, and as just a few leaves are afected and the damage looks so different its no boron def to me. Some leaves look like thripse damage, but if it would be thrips , you would have all leaves damaged....Iam not very sure what it is ---- waterdrops burnt from the sun=? the smll leave loks like you spilled something onto ... and i wont be concerned as long asit dont spread