1) no leak before deep cleaning? If yes move to # 2, if no replace seal.
2) go back and re-check that the crankcase vent lines haven't been kinked/pinched/occluded. Fixed or no problems noted go to #3.
3) with dentist pick or fine screwdriver an good lighting, inspect seal and attempt to reseat. Check for leaks. If it leaks, replace seal. If it stopped leaking go to #4
4) go to indyoem or other OEM parts house of your choosing an buy a new seal. Might as well replace it now.....
2001 #62. Ohlins rear/valves, Micron high mount, HyperPro damper, SharkSkinz, Tyga billet triple clamp, Tyga Carbon Fiber fender and hugger, Ti bolt/custom subframe/alien motion 8 cell diet, 15/41 520, COP conv. PCIII, Venhill lines, modified air box, turn signals in headlights...<deep breath> ZG Touring windscreen, Tech G rear sets, CRF450 rear master w/HRC cover, Tokico 6 pots w/V-pads, CRG Bar end mirrors, PSR Shorty levers-use only clutch, wanna-be basic racer paint, Roman Gold PC wheels