Inspection due. What to pay attention for? 87k miles

[sobi6111]

Car has 87400 miles now,so time for Service :-)
2002 X5 3.0i non sport

here is what service has been done for this car:

15 130 miles
16.04.2004 (day/month,year)
FOUND TENTIONER AND BELT DEFECTIVE, REPALCED WITH UPDATED PARTSBall joints, front axle wishbones(control arms)Brake fluid flushWiper blades replacedOil change

25735 02.08.2005(day/month/year)A/C COMPRESSOR CLUTCH MELTED (NOT ENGAGING) RECOVEREDREFRIGERANT - REPLACED COMPRESSOR - EVACUATED AND RECHARGED

29889 28.11.2005(day/month/year)REPLACED EXPANSION TANK AND BLEED COOLING SYSTEMREPLACED BOTH REAR TAIL LIGHT ASSEMBLYSREPLACED EVAPORATOR

52006 miles
30.04.2007(day/month/year)Replaced both front axlesReplaced turn signal sockets frontReplaced battery + key remotesOil ChangeAir filter replacedCabin filter replacedRear differential oil changeInspection II performedBrake system flushCooling system flushReplaced thrust rod bushingsBoth drive belts have been replacedBalance and rotote tires4 wheel alignment

66123
16.04.2008(day/month/year)Oil Change

66634
18.04.2008(day/month/year)InspectionAll 4 rotors replaced + pads

68557
29.04.2008(day/month/year)Headlight washer pump repaired Rear washer pump repairedRear license plate grab handle + bulbs socket replacedOil ChangeSummer inspection

68906
14.05.2008(day/month/year)Oil Change

70935
19.09.2008(day/month/year)New engine wiring + t-body New t-body inlet hoseNew thermostat + coolant fluid flush

71146
26.09.2008(day/month/year)Front Calipers repairedLeft door latch replacedBrake system flushFront right ball joint replacedFront right control lower armAlignmentTransmission fluid changed

72472
11.11.2008(day/month/year)Oil Change

72659
21.11.2008(day/month/year)New fuel filter

75267
07.01.2009(day/month/year)Steering wheel slip ring have been replacedOil Change

78504
10.03.2009(day/month/year)Oil Change

78514
11.03.2009(day/month/year)Air filter replacedCabin filter replaced

81360
23.03.2009(day/month/year)Oil Change

82438
24.04.2009(day/month/year)New rear control arms upper

83908
11.08.2009(day/month/year)Alignment + new oil

85309
03.09.2009(day/month/year)Front rotors + new brake pads DIY

86350
21.09.2009(day/month/year)Sway bar links front DIY

87123
08.10.2009 (day/month/year)
New oil + filter

Soon very cold winter coming ,don't want my car having issues or having blown gaskets and etc. Last winter it survived with no issues.

So what should i do for 90k miles service besides regual check-up and oi lchange?
Should i also clean drain plugs somehow?
Differential front and rear fluid?
Transfer case?
Spark plugs?
Idle control valve?
Engine oil pan gasket?
Oil seperator ?
Water pump?
Spark plugs?

Here are some things i notice : not stable idle sometimes when in D or R and foot on brake

Slight vibration in gas pedal when accelerating hard or when cold car

Engine cover(has oil on it,but it is not leaking,i guess from long time ago,or just spilled old one when they replacing it)

So give your ideas and suggestion please