97R 300tdi auto, 128K miles, has Goodyear Eagle GT+4 tyres all round, fitted by previous owner 3 years ago at 98K. Tread depth was recently assessed at 7/7/7 on both front tyres, 1/2/1 on the OSR, 5/4/5 on the NSR and I'm surprised it's so uneven. The OSF is losing some pressure, neither rear...